快適|かいてきkaiteki[0]heiban (flat)

1. na-adjective, nounpleasant; agreeable; comfortable
   これはたいそう快適かいてきな暖炉だんろですね。↗

   This is a very nice fireplace.

• Synonym心地よいここちよいNeutralNeutral adjective for a pleasant, often physical feeling, as in 「心地よい風」. 快適 is about comfortable conditions around you; this is about how something feels.
• Synonym快いこころよいWrittenWritten/formal prose word for feeling pleasant or refreshed, and for doing something gladly, as in 「快く引き受ける」. It centres on the feeling itself, not the surroundings.
• Synonym気持ちいいきもちいいCasualColloquial word for something that feels good, as in 「お風呂が気持ちいい」; it centres on the sensation and is the most casual word in this group.
• Related安楽あんらくWrittenWritten/formal prose word for a life of ease, as in 「安楽な老後」. It stresses being free of worry and toil rather than pleasant conditions.
• Related気楽きらくNeutralNeutral word for being relaxed and unencumbered, as in 「気楽な一人暮らし」. It is about having no mental burden, not about physical or environmental comfort.
• Related愉快ゆかいNeutralNeutral word for fun and enjoyment, as in 「愉快な仲間」. It stresses being happy or amused and does not describe comfortable surroundings.
• Antonym不快ふかいNeutralNeutral antonym: unpleasant or uncomfortable, as in 「不快感」. It is the direct opposite of 快適.
• Antonym不愉快ふゆかいNeutralNeutral antonym for feeling displeased or upset, as in 「不愉快な思い」. It stands opposite to both 愉快 and 快適.

Use 「快適」 for comfortable environments, facilities, or journeys. For bodily sensations pick 「心地よい」 or colloquial 「気持ちいい」; for mental ease 「気楽」; for fun 「愉快」. Antonyms: 「不快」, 「不愉快」.

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

1. とても気持きもちが良よい状態じょうたい。