Related words· 6 えーと is a filler used while thinking of what to say next, similar to ううん 's hesitation sense but slightly more focused on searching for words.
いや is another casual way to say 'no', but it can sound slightly more abrupt or assertive than ううん .
ううん is the casual, everyday way to say 'no' among friends or family, while いいえ is the polite, formal equivalent.
ううん is an even more casual, often childish or feminine way to say no, whereas いや sounds neutral in casual speech.
Show 2 more Show fewer うーん is a simple thinking sound with no implication of doubt, while はて suggests the speaker is puzzled by something specific.
うーん signals hesitation or careful thought, whereas ふん is more a quick acknowledgement or, in its sharper use, a dismissive snort.
Written forms ううん Usage 25%
Standard hiragana spelling for the hesitation sound and the casual negative reply.
うーん Usage 67% i Usage for this spelling across all readings, not one reading alone.
ウーン Usage 7% i Usage for this spelling across all readings, not one reading alone.
ウウン Usage <1%
Etymology An imitative vocal interjection representing a groan or sustained “uu” sound. From uses for exertion, pain, and hesitation it also developed contextual response meanings, including negation.
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