爽快|そうかいsoukai[0]heiban (flat)

1. na-adjective, nounrefreshing; exhilarating; invigorating; bracing
   私はプールでひと泳およぎした後あと、気分きぶんそう快かいだった。↗

   I felt refreshed after a swim in the pool.

• Synonym清々しいすがすがしいNeutralNative Japanese word for feeling fresh and clear-headed, as in 「清々しい朝」. Stresses the crisp, fresh feeling; 「爽快」 stresses exhilaration.
• Synonym爽やかさわやかNeutralThe most common everyday choice. Covers freshness and pleasantness, and can describe people, as in 「爽やかな笑顔」.
• Synonym清涼せいりょうWrittenMeans cool and refreshing; rather literary used alone, but common in 「清涼飲料水」. Emphasizes coolness rather than exhilaration.
• Synonym清爽せいそうWrittenWritten word used of fresh, crisp air; fairly rare.
• Related清新せいしんWrittenWritten word for something fresh and novel, as in 「清新な印象」「清新な空気」. 「爽快」 is about a pleasant, exhilarated mood.
• Antonym憂鬱ゆううつNeutralAntonym: gloomy and low-spirited, the opposite of feeling refreshed and exhilarated.
• Antonym不快ふかいNeutralAntonym: feeling unpleasant or unwell; the direct opposite of 「爽快」.

Use 「爽快」 for a feeling of exhilaration and refreshed spirits, as in 「爽快な気分」「爽快感」. For freshness say 「爽やか」 or 「清々しい」, for coolness 「清涼」; the antonyms are 「憂鬱」 and 「不快」.

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

1. 爽さわやかで気持きもちが良よいこと。