How to say "promptly" in Japanese

Choosing the right word
  • いち早くいちはやくCommon
    adverbCovers 'promptly' as swift reaction or action, often ahead of others. Typical contexts include reporting that a company or official responded swiftly the moment news broke.
    ねずみはいち早はやく沈しずみそうな船ふねを見捨みすてる。↗
    Rats leave a sinking ship.
  • 早々はやばやCommon
    adverb (with と)Covers 'promptly' but also plain 'early'; it often describes doing something soon after another event. Typical context: someone getting down to work right after arriving, or leaving a party early.
    彼かれは戦争せんそうが早々はやばやと終おわるとあてこんでいた。↗
    He gambled on the war coming to an early end.
  • さっさとJLPT N2approx.Common
    adverbCovers 'promptly' as brisk, no-nonsense speed; its onomatopoeic character can add a brusque or impatient tone. Typical context: telling someone to hurry up and finish, or someone leaving without lingering.
    さっさと宿題しゅくだいをしなさい。↗
    Do your homework without delay.
  • 早速さっそくJLPT N2approx.Common
    adverbCovers 'promptly' as getting on with something at once, without preliminaries; it often marks moving straight to the matter at hand. Typical context: starting a meeting or trying out a new tool right away.
    さっそく仕事しごとにとりかかりましょう。↗
    I will set about my task at once.
  • 言下げんかCommon
    nounA narrow word: it means responding promptly and on the spot, typically agreeing or refusing outright the moment something is said. It is seldom a general substitute for 'promptly' in other contexts.

All five can convey 'without delay', but 「いち早く」 stresses swift reaction, 早々 also means 'early', 「さっさと」 is brisk and brusque, 早速 moves straight to action, and 言下 is only for on-the-spot replies.

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

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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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