Inferential Suffixes in Japanese: ～そう, ～よう, ～らしい, ～みたい Compared

The difference between そう, らしい, みたい, and ようだ comes down to two questions: what kind of evidence you have, and how much you are willing to own the claim.¹ All four land in English as "seems," "looks like," or "I heard," but Japanese sorts them by source and by register, so the choice is rarely free.

Overview

This article maps the cluster on two independent axes: evidence type (what you saw, heard, or reasoned) and register with reliability (formal versus casual, plus how much you commit). It gives a single comparison table, a copy-pasteable decision tool, and a warning about the two traps that catch learners: the two different そう, and the evidential らしい that hides next to a "typical-of" らしい (子供らしい) of the same shape.

Why Japanese Has Four "Seems"

Japanese groups そう, よう, らしい, and みたい under indirect evidentiality. These are forms a speaker uses when a claim is reached indirectly, by conjecture or hearsay, rather than asserted flatly. Aoki's foundational survey treats らしい, そうだ, and ようだ as the morphosyntactic evidentials marking exactly this indirect-evidence space.¹

The traditional Japanese-grammar labels for the senses at play are 様態 (yōtai, "appearance or manner"), 推量 (suiryō, "conjecture or inference"), and 伝聞 (denbun, "hearsay or reported"). Teramura's analysis organizes そうだ, ようだ, and らしい around these modality categories.²

The two axes that separate them

The first axis is evidence type: the kind of source the claim rests on. Makino and Tsutsui's reference framing splits the set into a "hearing group" and a "seeing group." The hearing group is hearsay そう and らしい; the seeing group is appearance そう, よう, and みたい.³

So the first question is whether the basis was something heard or something observed.

The second axis is register and reliability: how the speaker packages the claim. Within the seeing group, ようだ is formal and writing-leaning, while みたいだ is its casual, conversational counterpart. This is a register difference over largely the same evidence.³⁴ Within the hearing group, hearsay そうだ relays a source faithfully and neutrally, while らしい lets the speaker stand back from the claim.⁵³

Asano-Cavanagh's semantic study confirms that the four are often used in similar situations and read in English as "it seems," "it appears," or "it looks like." Even so, they are not always interchangeable. This is why earlier scholarship uses axes like direct versus indirect evidence and objective versus subjective speaker attitude.⁵

ケーキが美味おいしそう。⁶
"The cake looks delicious."

The two-line ruby examples above and below show the split at work: the first rests on direct visual evidence, and the second relays something heard from a source.

駅前えきまえに新あたらしい店みせができたそうだ。⁷
"I hear a new shop has opened in front of the station."

Where these sit in the tense-aspect-mood system

These suffixes form the evidential and modal suffix layer of the predicate. They attach after the tense-aspect core of a clause and mark the speaker's evidential stance toward it. That is why grammars treat them with modality (モダリティ) rather than with plain tense.¹²

They mark stance, not time

A plain assertion (雨が降る, "it rains") carries no evidence marking. Adding an inferential suffix layers the speaker's source and certainty on top of that core. This is separate from whether the verb is past or present.¹

Aoki frames the whole set as the indirect-evidentiality system of Japanese, distinct from a flat assertion that signals no evidence at all.¹

The Four Suffixes at a Glance

Comparison table

This table is the main reference for the whole cluster. The two ～そう readings sit in different rows because they belong to different evidence groups: appearance ～そう is in the seeing group, hearsay ～そうだ is in the hearing group.³

Form (reading)	Japanese label	Evidence source	Reliability / commitment	Register	Rough English
appearance ～そう	様態	direct: what you see or sense now, or what looks about to happen	speaker's own immediate impression	neutral, conversational	"looks ~ / looks about to ~" 38
hearsay ～そうだ	伝聞	what you heard or read from a source	faithful, neutral relay of the source	neutral; fine in writing	"I hear that ~ / they say ~" 39
～らしい	推量 / 伝聞	external info, often heard, sometimes observed; source can be vague	speaker stays at arm's length; some judgment may mix in	neutral-to-casual	"apparently ~ / I gather ~" 53
～みたい(だ)	推量 (resemblance / inference)	direct observation or resemblance	speaker's own judgment	casual, speech	"seems ~ / looks like ~" 34
～ようだ	推量 (inference)	reasoned inference from observed evidence	speaker's own judgment	formal, writing	"appears ~ / it seems ~" 34

ようだ and みたいだ occupy essentially the same evidence cell. They differ by register, not by evidence type.³⁴

～そう: two different words sharing one shape

Appearance ～そう (様態) expresses a conclusion drawn from immediate, concrete, usually visual evidence: "it looks ~," or that something is about to happen.⁸ It attaches to the stem. An い-adjective changes 美味しい to 美味しそう; a な-adjective drops な, 元気な to 元気そう; and a verb takes the ます-stem, 降る to 降り to 降りそう.³⁸

今いまにも雨あめが降ふりそうだ。¹⁰
"It looks like it's about to rain any moment."

Hearsay ～そうだ (伝聞) relays information from a source. It attaches to the complete plain form, including the copula だ on a noun or な-adjective: 休みだそうだ, 降るそうだ, 美味しいそうだ.³⁹ It cannot be used when speaking to the very source you heard it from.³

天気予報てんきよほうによると、明日あしたは雨あめが降ふるそうだ。¹¹
"According to the forecast, I hear it'll rain tomorrow."

A short, reliable form test tells them apart: appearance そう grabs the stem; hearsay そう keeps the whole plain form. So 美味しそう is "looks delicious" while 美味しいそうだ is "I hear it's delicious."³⁸

The form test: short stem versus full plain form

If そう attaches to a bare stem (美味し-, 降り-), it is appearance. If it attaches to a complete plain-form word (美味しい, 降る), it is hearsay. Short means looks; long means heard.³⁸

One irregular pattern breaks the stem rule: いい and よい become よさそう, not いそう, and ない becomes なさそう. In both cases, さ is inserted before そう.³⁸

このスープ、よさそうだね。¹²
"This soup looks good, doesn't it."

～らしい: indirect, reliable-ish inference

らしい conveys something the speaker knows from external information, often something heard. It also lets the speaker keep distance from the claim. If the speaker's own judgment is slightly mixed into reported information, らしい is the choice; a pure faithful relay takes hearsay そうだ instead.⁵³

Compared with hearsay そうだ, らしい is used when the source is vaguer or less certain, more like a rumor than a named report. It reads as "apparently" or "I gather" rather than a clean "I hear that."³

Attachment is simple: らしい connects directly to plain forms, and to a bare noun with no だ (学生らしい, 人気らしい).³⁴

田中たなかさんは来月らいげつ引ひっ越こすらしい。¹³
"Apparently Mr. Tanaka is moving next month."

Asano-Cavanagh's semantic-prime analysis renders らしい as roughly "I think I can say something like this about X." This captures the speaker's hedged, arms-length stance.⁵

道みちが濡ぬれている。昨夜さくや雨あめが降ふったらしい。¹⁴
"The road is wet. It seems it rained last night."

～みたい: casual resemblance and inference

みたいだ expresses the speaker's own judgment from observation or resemblance. It is explicitly the casual, conversational form. References mark it as conversational and warn against it in essays, articles, or anything that needs to sound authoritative.³⁴

Attachment is the easiest of the set: みたい connects directly to any part of speech with no linking particle, including a bare noun (学生みたい, 暑いみたい, 静かみたい).³

外そと、雨あめが降ふっているみたい。¹⁵
"It seems like it's raining outside."

In its resemblance sense, みたい frames the referent as merely looking like X, and possibly not being X. By contrast, よう leans toward appearing to be X.⁴

制服せいふくを着きているから、学生がくせいみたいだ。¹⁶
"Because they're in a uniform, they look like a student."

～ようだ: the formal, written counterpart of みたい

ようだ expresses a reasoned inference from observed evidence and is the formal, writing-leaning member of the pair. It is the recommended alternative to みたい in formal or written contexts.³⁴

Attachment requires linking particles: な after a な-adjective and の after a noun (大切なようだ, 警察のようだ). It attaches directly to plain-form verbs and い-adjectives.³⁴

彼かれは何なにかに怒おこっているようだ。¹⁷
"He appears to be angry about something."

ようだ and みたいだ share essentially the same evidence space: inference from what is observed. The choice between them is primarily register, not evidence type.³⁴ Asano-Cavanagh renders ようだ as roughly "I think this about X at the moment." This foregrounds the speaker's present reasoned judgment.⁵

この資料しりょうを見みると、売上うりあげは回復かいふくしているようだ。¹⁸
"Looking at this document, sales appear to be recovering."

Choosing the Right One

A decision flow: what is your evidence?

The whole set sorts on one fork: was the basis something you heard, or something you observed and reasoned from? The diagram below traces that fork to a single form.

In ordered steps:

1. Did you get it from a source you heard or read? This puts you in the hearing group.
   • Relaying it faithfully and neutrally, "I hear that ~," takes hearsay そうだ (plain form + そうだ).³⁹
   • A vaguer source, or wanting to stay at arm's length, "apparently ~," takes らしい.⁵³
2. Are you reasoning from what you see or sense yourself? This puts you in the seeing and reasoning group.
   • An immediate visual impression, or something about to happen, "looks ~ / about to ~," takes appearance そう (stem + そう).³⁸
   • A reasoned inference that is formal or written, "it appears ~," takes ようだ.³⁴
   • The same inference in casual speech, "seems ~," takes みたいだ.³⁴

Register at a glance

For the inference forms, the order from formal to casual is ようだ (formal, writing), then らしい and hearsay そうだ (neutral, fine in speech or writing), then みたいだ (casual, speech).³⁴

ようだ fits essays, reports, and formal speech; みたいだ is conversational and should be avoided where the text needs to sound authoritative.⁴ Hearsay そうだ and らしい are register-neutral and sit comfortably in both speech and writing.³

Reliability and speaker commitment

The forms differ in how much the speaker owns the claim. Hearsay そうだ relays the source faithfully and neutrally, with no personal stance: "I just heard that ~."⁵³

らしい distances the speaker from the claim. Some of their own judgment can mix in, and the source may be vague: "apparently ~."⁵³ With みたいだ and ようだ, the claim is the speaker's own judgment from observed evidence. Commitment sits with the speaker rather than a third party.⁵³

Appearance そう is the most directly grounded form in the set: an immediate, on-the-spot impression from direct, usually visual, evidence.³⁸ Asano-Cavanagh's prime paraphrases line up with this. They contrast らしい, "I think I can say something like this about X" (hedged), with ようだ, "I think this about X at the moment" (owned present judgment).⁵

Nuance and Usage Contexts

When more than one is acceptable

When information is both heard and partly observed, らしい and みたい can both fit. But they shift the emphasis. らしい emphasizes the reported, arms-length side; みたい emphasizes the speaker's own observation. If the speaker's judgment is slightly mixed into reported information, らしい is apt. A pure relay would instead take hearsay そうだ.⁵³

ようだ and みたい can also both fit over the same observed-inference evidence. Here the choice is mostly formality: ようだ for writing or formal speech, みたい for casual speech.³⁴

The comparison/resemblance use (子供みたい, 〜のようだ)

Both みたい and よう also have a second, non-inferential function: "(just) like X" in similes and comparisons, distinct from "seems" or "looks like." 子供みたい(に) means "like a child," and 〜のようだ means "(is) like ~."⁴

まるで夢ゆめみたいだ。¹⁹
"It's just like a dream."

In the resemblance sense, みたい frames the referent as only looking like X, possibly not actually being X. よう leans toward appearing to be X. This is the same casual-versus-formal pair carried into the simile use.⁴ The inference reading and the resemblance reading share one surface form, and context decides which is in play. Detail on each belongs to the dedicated drill-down articles.

彼女かのじょは天使てんしのような人ひとだ。²⁰
"She's a person like an angel."

Neighbouring forms not in this set

っぽい sits near the cluster. It is casual and attaches to nouns, and some stems, to mean "~ish" or "~like." It points to an innate trait or impression rather than a reasoned inference, as in 子供っぽい, "childish."²¹ It overlaps with the resemblance edge of みたい, but it stays outside the four-way inference comparison here.

Good to know

Two らしい are hiding here

The same surface string, らしい, represents two different grammatical objects. One is the evidential or hearsay らしい of this article: "apparently" or "I gather." It attaches to a clause or to a noun-as-predicate with no だ. The other is the "typical-of" suffix らしい: "befitting" or "characteristic of X." It attaches to a bare noun to form an adjective, as in 男らしい, 子供らしい, 自分らしい.⁵³

Use evidential らしい when reasoning from external or heard information. The typical-of らしい says the referent embodies the qualities expected of X. They look identical but mean different things, and the typical-of use has its own dedicated article.

A quick disambiguation test settles ambiguous cases. 彼は学生らしい is ambiguous out of context. With いかにも ("every bit"), it reads as the typical-of suffix: "he's every bit the proper student." With どうやら ("apparently"), it reads as the evidential: "apparently he's a student."

どうやら彼かれは学生がくせいらしい。²²
"Apparently he's a student."

The contrasting typical-of reading, which is the other word, surfaces with いかにも.

いかにも学生がくせいらしい、まじめな青年せいねんだ。²³
"An earnest young man, every bit the proper student."

The most common mix-up: stem-そう vs plain-そう

Appearance そう grabs the stem (おいしそう, 降りそう). Hearsay そうだ keeps the whole plain form (おいしいそうだ, 降るそうだ). The shortcut is short means looks, long means heard.³⁸

この問題もんだいは難むずかしそうだ。²⁴
"This problem looks difficult."

The same adjective with hearsay そうだ keeps its full plain form and flips the meaning.

この問題もんだいは難むずかしいそうだ。²⁵
"I hear this problem is difficult."

The いい to よさそう irregular is the trap inside the trap: appearance そう on いい is not いそう but よさそう. ない becomes なさそう. The full drill-down lives in the appearance-そう article.³⁸

Don't say ～そう/らしい about your own feelings

Evidentials describe states observed from the outside. So using one to report your own inner state misfires. Saying 私は嬉しそうだ for "I'm happy" treats your own emotion as if you were observing yourself from outside. The plain assertion is the correct form.

私わたしは嬉うれしい。¹
"I'm happy."

You have direct access to your own feelings, so you assert them plainly rather than report them as if you were observing yourself. The evidentials mark indirect access, which does not apply to one's own inner states.¹⁵

See also

• ～でしょう / ～だろう: Conjecture and Confirmation in Japanese
• ～かもしれない vs ～にちがいない: Possibility and Certainty in Japanese
• The ～げ Suffix: How to Say Someone "Looks / Seems" a Feeling in Japanese (悲しげ, 楽しげ)
• ～がる: How to Say Someone "Shows Signs of" a Feeling in Japanese
• ～かのように / ～かのような: How to Say "As If" in Japanese (the Counterfactual Resemblance)
• Japanese Adjectives Overview: The Two Classes (い-形容詞 vs な-形容詞)

References

Footnotes

1. Aoki, Haruo. "Evidentials in Japanese." In Evidentiality: The Linguistic Coding of Epistemology, ed. Wallace Chafe and Johanna Nichols, pp. 223–238. Norwood, NJ: Ablex, 1986. https://www.cambridge.org/core/books/abs/japanese/references/281F76A23C76D4115F7DC13A95D71D3A ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷

2. Teramura, Hideo (寺村秀夫). Nihongo no shintakusu to imi (日本語のシンタクスと意味), Vol. 2. Tokyo: くろしお出版, 1984. ↩ ↩²

3. Wasabi. "How to Express Judgments: そうだ, ようだ, みたいだ, and らしい." https://wasabi-jpn.com/magazine/japanese-grammar/how-to-express-judgments/ (limitation) ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹ ↩²⁰ ↩²¹ ↩²² ↩²³ ↩²⁴ ↩²⁵ ↩²⁶ ↩²⁷ ↩²⁸ ↩²⁹ ↩³⁰ ↩³¹ ↩³² ↩³³ ↩³⁴ ↩³⁵ ↩³⁶ ↩³⁷ ↩³⁸ ↩³⁹ ↩⁴⁰

4. Kim, Tae. Tae Kim's Guide to Learning Japanese, "Expressing similarity or hearsay." https://guidetojapanese.org/learn/grammar/similarity (limitation) ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷

5. Asano-Cavanagh, Yuko. "Semantic analysis of evidential markers in Japanese: Rashii, yooda and sooda." Functions of Language 17, no. 2 (2010): 153–180. https://doi.org/10.1075/fol.17.2.01asa ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴

6. Natural sentence illustrating appearance そう on an い-adjective stem; the おいしい → おいしそう pattern is attested in ³⁸. ↩

7. Natural sentence illustrating hearsay そうだ on a plain past verb; the plain-form + そうだ hearsay pattern is attested in ³⁹. ↩

8. Maggie Sensei. "〜そう = looks (like) 〜, going to 〜." https://maggiesensei.com/2010/09/20/request-lesson-%E3%80%9C%E3%81%9D%E3%81%86-sou-looks-like-%E3%80%9C-going-to/ (limitation) ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹

9. Bunpro. Grammar point そうだ (hearsay, N3). https://bunpro.jp/grammar_points/%E3%81%9D%E3%81%86%E3%81%A0 (limitation) ↩ ↩² ↩³ ↩⁴

10. Natural sentence illustrating appearance そう on a verb ます-stem ("about to happen"); the 降る → 降りそう pattern is attested in ³⁸. ↩

11. Natural sentence illustrating hearsay そうだ with an explicit source (天気予報); the plain-form + そうだ hearsay pattern and the source-relay reading are attested in ³⁹. ↩

12. Natural sentence illustrating the appearance irregular いい → よさそう; the よさそう irregular is attested in ³⁸. ↩

13. Natural sentence illustrating evidential らしい on a plain verb; clause + らしい hearsay/inference is attested in ³⁴. ↩

14. Natural sentence illustrating らしい as inference from observed evidence (wet road); inference-from-evidence らしい is attested in ³⁴. ↩

15. Natural sentence illustrating casual みたい inference; direct-attachment みたい and its casual register are attested in ³⁴. ↩

16. Natural sentence adapted from Tae Kim's attested 「学生みたいです」; noun + みたい (no particle) is attested in ³⁴. ↩

17. Natural sentence illustrating ようだ inference on a plain-form verb; verb + ようだ inference is attested in ³⁴. ↩

18. Natural sentence illustrating ようだ in written/formal register (reasoning from a document); the formal/written register of ようだ is attested in ³⁴. ↩

19. Natural sentence illustrating the resemblance use まるで〜みたい; the みたい resemblance use is attested in ⁴. ↩

20. Natural sentence illustrating the formal resemblance 〜のような; noun + の + ような resemblance is attested in ⁴. ↩

21. Coto Academy. "Guide to Using Sou (そう), Rashii (らしい), Mitai (みたい) and Poi (っぽい)." https://cotoacademy.com/rashii-mitai-poi/ (limitation) ↩

22. Natural sentence illustrating the evidential reading of 彼は学生らしい with disambiguating どうやら; the clausal evidential らしい is attested in ⁵³. ↩

23. Natural sentence illustrating the typical-of (suffix) reading of 学生らしい with disambiguating いかにも, contrasted against the evidential; the two-らしい split is noted in ⁵³ (full treatment in the dedicated typical-of article). ↩

24. Natural sentence illustrating appearance そう on an い-adjective stem (難し + そう); the stem-attachment rule is attested in ³⁸. ↩

25. Natural sentence illustrating hearsay そうだ on a plain い-adjective (難しい + そうだ); the plain-form-attachment hearsay rule is attested in ³⁹. ↩