不快|ふかいfukai[0]heiban (flat)

1. noun, na-adjectivedispleasure; discomfort; unpleasantness
   その腐くさった肉にくはひどく不快ふかいな匂においがした。↗

   The spoiled meat had a nasty smell.
2. nounindisposition; ailment

• Synonym不愉快ふゆかいNeutralCovers unpleasantness that rubs you the wrong way, as in 「不愉快な出来事」 or 「不愉快な音」; unlike 「不快」, it does not refer to poor physical condition.
• Synonym気持ち悪いきもちわるいCasualColloquial: gross or sickening, also feeling like vomiting; stresses a physical reaction of disgust.
• RelatedいやらしいNeutralColloquial: off-putting or nasty, and can also mean lewd; its tone is more subjective and forceful than 「不快」.
• RelatedいやCasualThe everyday spoken choice for dislike or reluctance; 「不快」 is more written-style and centers on an unpleasant mood or feeling unwell.
• Related厭わしいいとわしいWrittenLiterary and old-fashioned: so disagreeable you want to avoid it; in daily conversation say 「嫌」 instead.
• Antonym快適かいてきNeutralThe direct opposite of 「不快」: comfortable and pleasant, as in 「快適な生活」.
• Antonym愉快ゆかいNeutralPleasant and enjoyable; the cheerful opposite of 「不快」.
• Antonym気持ちいいきもちいいCasualColloquial for feeling good or comfortable; the spoken opposite of 「不快」.

In writing, use 「不快」 for displeasure, as in 「不快感」. For interpersonal unpleasantness choose 「不愉快」; in speech say 「嫌」 or 「気持ち悪い」. The opposite is 「快適」.

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

1. 仲なかが悪わるいこと。
2. 身体しんたいの調子ちょうしが優すぐれないこと、不調ふちょうであること。
3. 面白おもしろくないこと、不愉快ふゆかいであること。