敏速|びんそくbinsoku[0]heiban (flat)

1. na-adjective, nounquickness; agility; activity
   彼かれらは合意ごういの上うえで敏速びんそくな行動こうどうをとった。↗

   They acted immediately by agreement.

• Synonym迅速じんそくWrittenWritten in flavor; stresses very fast handling or action, as in 「迅速な対応」. More common than 「敏速」.
• Synonym機敏きびんWrittenWritten; stresses reacting quickly to the situation at hand — quickness of mind more than of movement, so it leans more toward alert wit than 「敏速」.
• SynonymスピーディーCasualColloquial loanword for speedy; stresses fast pace and efficiency, heard often in business and advertising.
• Synonym素早いすばやいNeutralNeutral and everyday; covers quick movement or quick judgement — the common word for nimble in daily speech.
• Synonym早いはやいNeutralThe everyday default for 'fast' or 'early'; covers sheer speed and also time (early, soon), which 「敏速」 does not.
• Synonym速やかすみやかWrittenWritten; stresses doing something at once, without delay, as in 「速やかに退出」 — promptness rather than agility.
• Related手早いてばやいCasualColloquial; describes working briskly and deftly — quick, tidy hands at a task rather than overall speed of movement.
• Related手ばしこいてばしこいCasualColloquial and rare; movements that are both quick and nimbly skilful.
• Antonym緩慢かんまんWrittenWritten antonym: slow movement or change (also lax handling), the opposite of the quick 「敏速」.
• Antonym遅鈍ちどんWrittenWritten antonym: dull and slow in movement or reaction, the opposite of the agile 「敏速」.

「敏速」 is a written, formal word for quick, agile action or reaction, as in 「敏速な行動」. 「迅速」 is the more common choice for speed of handling; 「機敏」 adds quick-witted adaptability; 「素早い」 is the everyday word; 「緩慢」 is its opposite.

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

1. 素早すばやいこと。また、そのようなさま。敏捷びんしょう。