今晩|こんばんkonban[1]atamadaka (head-high)

1. noun, adverbtonight; this evening
   今晩こんばんは少すこし熱ねつっぽいのです。↗

   I feel a bit feverish tonight.

• Synonym今宵こよいWrittenA literary, archaic word for tonight with a poetic flavor; in conversation it usually appears when someone is deliberately setting a mood. Normally say 「今晩」.
• Synonym今夜こんやNeutralBasically synonymous with 「今晩」, but 「今夜」 can also refer to the later, deeper hours of the night.
• Antonym今朝けさNeutralThe opposite of 「今晩」: it means this morning, the contrasting time of day within the same day.

For tonight, the default choices are 「今晩」 and 「今夜」; 「今夜」 can also stretch to the late-night hours. Save 「今宵」 for a literary or deliberately atmospheric tone, and use 「今朝」 for this morning.

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

1. 今日きょうの夜よる。