The ～っぽい Suffix: How to Say "-ish / Has the Qualities Of" in Japanese (子供っぽい, 忘れっぽい)

The ～っぽい suffix is a productive ending. It attaches to a base word and builds a new い-adjective meaning that the referent "has the qualities of," "is tinged with," or "tends toward" that base.¹² It is the casual workhorse behind everyday words like 子供っぽい "childish," 赤っぽい "reddish," and 忘れっぽい "forgetful." It often carries a connotation that tips toward criticism.

Overview

What っぽい does

っぽい is a 接尾語 (suffix) that takes a base and forms a new い-adjective. The resulting word says the referent has the base's distinctive characteristic, resembles it, is tinged with it, or tends toward it.¹²

Makino and Tsutsui define -ppoi as a suffix indicating that someone or something "has some distinctive characteristic or an attribute identified by a noun, an adjective, or a verb to which the suffix is attached."²

The 精選版 日本国語大辞典 splits the suffix into four senses based on what it attaches to: a noun ("contains much of, closely resembles"), a color name ("tinged with that color"), an adjective or adjectival-verb stem ("that quality shows on the surface"), and a verb ます-stem ("has a strong tendency to do readily").¹ The デジタル大辞泉 condenses these into two: "contains much of" and "has a strong tendency toward."³

彼女はほこりっぽい部屋へやを片付かたづけた。¹
"She tidied up the dusty room."

彼かれの話はなしはいつも理屈りくつっぽい。¹
"His way of talking is always overly argumentative."

Register and JLPT placement

っぽい is casual and colloquial in register. Bunpro classifies it as casual,⁴ and Coto Academy describes it as "casual, like '-ish' in English."⁵

Keep one nuance in mind throughout: っぽい frequently skews negative. Bunpro notes it "often has negative connotation" and that "the speaker feels like (A) is in excess, compared to what would be expected."⁴ Coto Academy describes its use as characterizing food or objects unfavorably.⁵

The negative skew is a tendency, not a rule

Some bases stay neutral or positive: 色いろっぽい reads as admiring ("alluring, sexy"), and 男おとこっぽい can be a neutral "mannish." The skew is strongest when a noun base names a category the subject is measured against and seems to exceed, as with 子供こどもっぽい said of an adult.⁴⁵

This article treats っぽい as JLPT N3 (sometimes catalogued N2). No official Japan Foundation grammar list settles the split. The graded references that assign a level agree on N3,⁴⁶ while some teaching sites file it under N2. Both placements are defensible.

Form: the three attachment bases

The suffix attaches to three productive kinds of base, and each shades the meaning differently.

Noun + っぽい ("-ish, -like")

With a noun base, the result means the referent "has the qualities of, resembles, or contains much of" the noun.¹² This is sense ① in the 精選版 日本国語大辞典.¹

Common fixed members of this class include 子供っぽい "childish," 大人っぽい "grown-up, mature-seeming," 男っぽい "mannish," 女っぽい "feminine," 色っぽい "alluring," and 理屈っぽい "argumentative." The suffix attaches to the bare noun, with no の or な between the noun and suffix (子供 + っぽい → 子供っぽい).²

私わたしはあなたの子供こどもっぽいところが好すきです。⁶
"I like your childish side."

あの小学生しょうがくせいは大人おとなっぽい。⁶
"That elementary-school kid seems very grown-up."

彼女かのじょは男おとこっぽい話はなし方かたをする。⁷
"She talks in a mannish way."

Color and substance or quality + っぽい ("tinged with, -ish")

A color-name base expresses being tinged with that color.¹ This is sense ②, attested with 赤っぽい "reddish" and 黒っぽい "blackish"; 白っぽい "whitish" and 青っぽい "bluish" follow the same pattern.

A substance or quality base gives the "contains much of, too much of" reading: 水っぽい "watery, watered-down," 油っぽい "greasy," 粉っぽい "powdery," ほこりっぽい "dusty."¹⁴³ This substance reading often sounds like a complaint. The connotation section below returns to that point.

遠とおくの山やまが白しろっぽく見みえる。¹
"The far-off mountains look whitish."

この服ふくは黒くろっぽいから、汚よごれが目立めだたない。¹
"These clothes are blackish, so stains don't show."

朝あさ起おきると顔かおが油あぶらっぽいです。⁶
"My face is oily when I wake up in the morning."

Verb ます-stem (連用形) + っぽい ("prone to, tends to")

With a verb's ます-stem (連用形), the suffix means the person "has a strong tendency to do something readily" (すぐに…する傾向けいこうが強つよい).¹ This is sense ④. Makino and Tsutsui gloss the verb case as "easy to do, often do."²

The mora before っぽい is the ます-stem, not the dictionary form. 忘れっぽい "forgetful" comes from 忘れる, 怒りっぽい "quick to anger" from 怒る, and 飽きっぽい "easily bored, fickle" from 飽きる.¹⁴⁶⁷ This base describes a person's dispositional, inherent tendency.

年としを取とると、忘わすれっぽくなる。⁶
"As you get older, you become more forgetful."

彼かれは怒おこりっぽいが、良よい友人ゆうじんだ。⁶
"He's hot-tempered, but he's a good friend."

君きみは飽あきっぽいから何事なにごとも成功せいこうしないのだ。⁶
"You never succeed at anything because you give up so easily."

っぽい behaves like an い-adjective

Conjugation: negative, past, adverbial

Because the formed word ends in -i and is itself an い-adjective, it inflects exactly like any other い-adjective.⁴ Bunpro says it plainly: っぽい "creates い-Adjectives from other words."⁴

The full paradigm of 子供っぽい follows the ordinary い-adjective pattern:

Form	子供っぽい	English
Plain	子供こどもっぽい	"is childish"
Negative	子供こどもっぽくない	"is not childish"
Past	子供こどもっぽかった	"was childish"
Negative past	子供こどもっぽくなかった	"was not childish"
Adverbial (連用形)	子供こどもっぽく	"childishly"
Te-form	子供こどもっぽくて	"being childish, and…"

The adverbial form appears in natural speech: 忘れっぽくなる "to become forgetful"⁶ and 白っぽく見える "to look whitish" both use the い-adjective 連用形.

もう大人おとなだから、子供こどもっぽくない服ふくを選えらぼう。⁴
"I'm an adult now, so let me pick clothes that aren't childish."

学生がくせいのころの私わたしは、今いまよりずっと子供こどもっぽかった。⁴
"Back when I was a student, I was much more childish than I am now."

彼女かのじょは子供こどもっぽく笑わらった。⁴
"She laughed childishly."

The っぽさ noun form

Since っぽい is an い-adjective, the ～さ nominalizer attaches in the usual way: drop the final -i and add さ, yielding っぽさ.² This gives forms such as 子供っぽさ "childishness," 安っぽさ "cheap-lookingness," and 大人っぽさ "a grown-up air."²

彼かれの絵えには子供こどもっぽさが残のこっている。²
"There's still a childish quality left in his drawings."

この鞄かばんは値段ねだんのわりに安やすっぽさがない。²
"For its price, this bag doesn't look cheap at all."

Nuance and usage contexts

The often-negative / excess connotation

The negative skew comes from excess: the speaker perceives the quality as more than what is expected or appropriate. Bunpro frames it as the speaker feeling "(A) is in excess, compared to what would be expected."⁴

子供っぽい applied to an adult is criticism, because the adult is being measured against "childlike" and judged to exceed it.⁴⁵ Coto Academy describes 子供っぽい as an adult behaving childishly, with the referent "not actually a child" but acting that way.⁵

The substance bases lean toward complaint in the same way: 水っぽい of soup or sake means "watered-down, weak," a defect,⁴ and 油っぽい of food means "too greasy."⁶

安っぽい has drifted past literal price

安っぽい has become a fixed word meaning "looks cheap or shoddy," well beyond the bare meaning of 安やすい "inexpensive." The 精選版 日本国語大辞典 files it under the adjective-stem sense ③, "the quality showing on the surface,"¹ and JLPT Sensei glosses 生地きじが安やすっぽい as "the material looks cheap."⁶

Not every base is negative. 色っぽい "alluring" is admiring, and 男っぽい or 大人っぽい can read as neutral-to-positive depending on context. The connotation is a strong tendency, not an absolute rule.

このワインは水みずっぽくて、あまりおいしくない。⁴
"This wine is watery and not very good."

この靴くつ、デザインはいいけれど、生地きじが安やすっぽいね。⁶
"These shoes have a nice design, but the material looks cheap."

30さんじゅっ歳さいにもなって、その言いい方かたは子供こどもっぽいよ。⁴
"You're thirty now; that way of putting it is childish."

っぽい vs らしい: excess vs befitting

This is the comparison learners search for most. らしい (the "typical of, befitting" suffix) and っぽい both attach to nouns and both translate loosely as "X-like." But they diverge sharply in how they evaluate the referent.

Aspect	～らしい	～っぽい
Core sense	befitting, living up to the ideal of X	resembles, has a tinge or excess of X
Evaluation	positive or neutral	frequently negative
Said of a child	子供こどもらしい "childlike in a fitting way"	子供こどもっぽい "immature" (odd of a real child)
Said of an adult	praises ideal conduct	criticizes immature conduct
男 pairing	男おとこらしい "manly, dependable" (admiring)	男おとこっぽい "mannish" (plain description)

Coto Academy states the split directly: 子供っぽい means "behaving childishly," whereas 子供らしい means "behaving exactly as a child should."⁵ Bunpro contrasts っぽい "usually with a negative nuance" against らしい, which "implies that someone embodies expected traits."⁴

The 男 pair shows the same divide. 男らしい reads as admiring ("manly, brave, dependable, befitting a man"), while 男っぽい is a plain description ("mannish, having a masculine tinge") with none of the praise. らしい points at the ideal. っぽい points at the resemblance or excess.⁴⁵

A two-word memory hook for the pair

Read らしい as befitting and っぽい as resembling. A child who is 子供こどもらしい is being a good child; an adult who is 子供こどもっぽい is failing to be a good adult.⁵

The academic basis for treating the two as a contrasting pair is 小島聡子 (2003). That study examines っぽい and らしい together as suffixes whose senses have shifted in younger-speaker usage, with っぽい spreading into territory once held by らしい.⁸

子供こどもらしい素直すなおな笑顔えがおだね。⁵
"What an innocent, child-becoming smile."

いい年としをして、子供こどもっぽいことを言いうな。⁴
"You're old enough to know better; don't say such childish things."

彼かれは男おとこらしい人ひとだが、彼女かのじょも男おとこっぽい性格せいかくだ。⁵
"He's a manly type, and she has a mannish streak too."

Good to know

The geminate っ belongs to the suffix, not the base

A common slip is to write 子供ぽい, dropping the small っ that a learner may not hear clearly. The suffix is っぽい, and attaching it geminates to /pp/, so kodomo + ppoi spells 子供っぽい. Dictionary headwords keep the geminate after a vowel-final base, as in 安っぽい and 忘れっぽい.¹² The correct form is below.

子供こどもっぽい
"childish"

忘れっぽい is not the same as 忘れやすい

忘れっぽい describes an inherent personal tendency, a forgetful character (忘れっぽい人 "a forgetful person"). It is the ます-stem + っぽい "prone to" reading.¹² 忘れやすい, the ～やすい "easy to do" compound, means "easy to forget" and can describe a thing or situation, not only a person (このパスワードは忘れやすい "this password is easy to forget").

The two translate loosely as the same thing, but っぽい on a verb stem marks a personal disposition (傾向が強い),¹ while やすい marks the ease or likelihood of the action. Saying ?この本は忘れっぽい to mean "this book is easy to forget" is wrong. The natural sentence is この本は忘れやすい.

Casual sentence-final っぽい for "seems like, apparently"

In casual speech and informal writing, っぽい increasingly attaches to a whole plain clause, including the plain past, to hedge a statement: 終わったっぽい "looks like it's over," 違うっぽい "seems wrong." Here it works as a modal of inference, a form that marks the speaker's judgment, close to よう, らしい, or みたい.⁹

Higashihira (2018) analyzes this development, noting that -ppoi "has been recently used in colloquial written language as a modal expressing the speaker's judgment" and that these new uses are "interchangeable with yoo, rashii, mitai, or kusai."⁹ This is the colloquial extreme of the suffix. It is marked as casual and is not an option for formal writing.

っぽい is old and still spreading

The suffix reaches well back into the Edo period: 飽きっぽい appears in the comic novel 浮世風呂 (1809–13), and 荒っぽい in the senryū collection 柳多留 (1780).¹⁰ The 日本国語大辞典 (第二版) lists 128 words formed with っぽい or ぽい. The suffix remains highly productive, with 小島 (2003) documenting its spread into new bases and into the younger-speaker modal use.¹⁰⁸

The lexicographer 神永曉 notes that even the ultimate origin of っぽい "is not well understood."¹⁰ っぽい is a living, expanding suffix rather than a closed list. That explains why dictionaries cannot catalog every form and why new coinages like 終わったっぽい keep appearing.

See also

• The ～らしい Suffix: How to Say "Typical of X" in Japanese (男らしい, 自分らしい)
• ～がる: How to Say Someone "Shows Signs of" a Feeling in Japanese
• The ～げ Suffix: How to Say Someone "Looks / Seems" a Feeling in Japanese (悲しげ, 楽しげ)
• Inferential Suffixes in Japanese: ～そう, ～よう, ～らしい, ～みたい Compared
• い-Adjective Conjugation in Japanese: All Tenses and Forms
• Adjective Stem Nominalization in Japanese: ～さ vs. ～み

References

Footnotes

1. 精選版 日本国語大辞典. 「っぽい」項. 小学館. (Definition consulted via Kotobank, the publisher-authorized digital edition.) https://kotobank.jp/word/っぽい ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷

2. Makino, Seiichi, and Michio Tsutsui. A Dictionary of Intermediate Japanese Grammar (『中級日本語文法辞典』). The Japan Times, 2001. Entry for "-ppoi." ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹²

3. デジタル大辞泉. 「っぽい」項. 小学館. (Consulted via Kotobank / Weblio, the publisher-authorized digital editions.) https://kotobank.jp/word/っぽい ↩ ↩²

4. Bunpro. "っぽい (JLPT N3)." https://bunpro.jp/grammar_points/312 (limitation: community-driven learner reference) ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹

5. 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: language-school blog) ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰

6. JLPT Sensei. "JLPT N3 Grammar: っぽい (ppoi) Meaning." https://jlptsensei.com/learn-japanese-grammar/っぽい-ppoi-meaning/ (limitation: learner-site, not academic) ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹²

7. Maggie Sensei. "How to use 〜っぽい ( = ~ppoi) ~ish/-like." https://maggiesensei.com/2009/09/16/「〜っぽい」ish-like-video-follow-up/ (limitation: personal teaching blog) ↩ ↩²

8. 小島聡子.「接尾語「ぽい」の変化」.『明海日本語』第8号, 明海大学日本語学会, 2003, pp. 31–38. (キーワード：接尾語，「（っ）ぽい」，若者言葉，辞書，「らしい」.) https://dl.ndl.go.jp/view/prepareDownload?itemId=info:ndljp/pid/3860261&contentNo=1 ↩ ↩²

9. Higashihira, Fukumi. "The Japanese Suffix -Ppoi as a Modal." International Journal of Language and Linguistics, vol. 5, no. 4, December 2018, doi:10.30845/ijll.v5n4p17. https://ijllnet.thebrpi.org/journals/Vol_5_No_4_December_2018/17.pdf (abstract indexed at https://ijllnet.thebrpi.org/journal/index/2493) ↩ ↩²

10. 神永曉.「第489回　増殖を続ける「っぽい」」. 連載コラム「日本語、どうでしょう？」. ジャパンナレッジ (JapanKnowledge). https://japanknowledge.com/articles/blognihongo/entry.html?entryid=508 ↩ ↩² ↩³