〜っぽい
-ish, -like; tends to
Noun / Verb ます-stem / い-adj stem + っぽい
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っぽい makes an い-adjective meaning "-ish" or "having the feel of": 子どもっぽい, "childish"; 白っぽい, "whitish"; 風邪っぽい, "like I'm coming down with a cold".
After a ます-stem, it describes a tendency, usually a bad one: 忘れっぽい, "forgetful"; 怒りっぽい, "short-tempered"; 飽きっぽい, "quickly bored".
It conjugates like any い-adjective: 子どもっぽくない, 忘れっぽくなった.
Compare らしい, "typical of, as it should be": 子どもらしい is a compliment ("like a real kid"), while 子どもっぽい is a criticism ("childish"). In casual speech, っぽい also means "seems like": あの人、先生っぽいね, "that person seems like a teacher".
Register: Casual.
Examples
この服、ちょっと子どもっぽいね。
These clothes are a bit childish.
風邪っぽいから、今日は早く寝る。
I think I'm coming down with a cold, so I'm going to bed early.
最近、忘れっぽくなった。
I've become forgetful lately.
白っぽいシャツを探しています。
I'm looking for a whitish shirt.
彼は怒りっぽい性格だ。
He has a short temper.