How to say "abrupt" in Japanese

Choosing the right word
  • 突然とつぜんJLPT N3approx.Common
    no-adjective, na-adjective, adverbThe all-purpose word for something that happens suddenly and without warning — an abrupt ending, departure, or change of subject. When you are unsure which word 'abrupt' calls for, this is the safe choice.
    すべて突然とつぜん起おこった。↗
    Everything happened all at once.
  • 急きゅうJLPT N4approx.Common
    na-adjectiveIt shares 突然's meaning of 'sudden, unexpected' but appears chiefly as the modifier 急な or the adverb 急に rather than standing alone; think of a sudden stop or a sudden change of plans.
  • 唐突とうとつCommon
    na-adjective, nounFor 'abrupt' remarks, questions, or changes of topic that arrive without any lead-up and so feel jarring or disconnected. It often implies the suddenness was somehow out of place or hard to follow.
    唐突とうとつな質問しつもんに彼かれは泡あわを食くった。↗
    He was confused by a sudden question.
  • 急激きゅうげきJLPT N3approx.Common
    na-adjectiveThe word for abrupt change: a sharp, rapid, or drastic rise, fall, or shift. It describes the rate or magnitude of a change rather than whether it took you by surprise.
    その党とうは急激きゅうげきにのびた。↗
    The party gained ground rapidly.
  • 不意ふいJLPT N1approx.Common
    na-adjective, no-adjectiveDescribes something unforeseen that catches a person off guard — an unexpected visitor, a question out of nowhere. It stresses the surprise of the person it happens to more than 突然 does.
    砦とりでは不意ふいに攻撃こうげきされた。↗
    The fort was attacked by surprise.

Use 突然 for anything sudden and unexpected, 急激 for sharp or rapid change, 唐突 for remarks or actions that jar through lack of lead-up, 不意 for what catches someone off guard, and 急 mainly as a modifier.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

Japanese equivalents
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JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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