忙しい|いそがしいisogashii[4]nakadaka (mid-high)

1. i-adjectivebusy; occupied; hectic
   あいつはのらりくらりの仕事しごとにお忙いそがしい事ことだ。↗

   He is busy loafing on the job.
2. i-adjectiverestless; hurried; fidgety

• Synonym繁忙はんぼうWrittenWritten/formal prose. Describes being swamped with business, mostly for industries or seasons, as in 「繁忙期」 and 「年末の繁忙」; it leans toward written and business use.
• Synonym多忙たぼうWrittenWritten-leaning word for being very busy, as in 「多忙な毎日」. In polite set phrases like 「ご多忙のところ」 it refers to the listener's busyness.
• Synonym慌ただしいあわただしいNeutralNeutral. Busy and rushed with no chance to settle, as in 「慌ただしい年末」 or 「慌ただしく出かける」; fits hectic, hurried situations.
• RelatedせわしないCasualColloquial. Hurried and unable to settle, stressing the flustered feeling rather than the workload, as in 「せわしない一日」.
• Related忙しげせわしげCasualColloquial. Says someone looks busy or flustered — the impression in another person's eyes, not the actual busyness itself.
• Antonym暇ひまNeutralNeutral antonym. Having nothing to do, with free time on your hands — the direct opposite of 「忙しい」.
• Antonym暇なNeutralNeutral antonym in attributive use, describing something as free or unoccupied, as in 「暇な時間」.

Default to 「忙しい」. Use 「繁忙」 for industry or seasonal peaks, 「多忙」 for very busy in written or polite style (「ご多忙」 when addressing someone), 「慌ただしい」 for rushed, hectic days, 「せわしない」 for being unable to settle, and 「暇」 for having free time.

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

1. 時間的じかんてきな余裕よゆうがない。他ほかのことに手てを出だす余裕よゆうがない。せわしい。仕事しごとが多おおい。
2. 性格せいかくなどがせかせかしている。気忙きぜわしい。せわしない。