EntryCommonJLPT N2
  1. Adverb (fukushi), Adverb taking the 'to' particle, Suru verb

    carelessly; thoughtlessly; inadvertently

    Onomatopoeic or mimetic word

    うっかりそれを忘れるところだったわ。
    I almost forgot all about that.

Also written ウッカリ

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