| 快適 | かいてき | pleasant, agreeable, comfortable |
| 明快 | めいかい | clarion, clarity |
| 快挙 | かいきょ | brilliant achievement |
| 豪快 | ごうかい | hearty, exciting, stirring, lively, heroic, largehearted, splendid |
| 快い | こころよい | pleasant, agreeable |
| 軽快 | けいかい | casual (e.g. dress), light, nimble, jaunty, rhythmical (e.g. melody); taking a turn for the better, receding of symptoms |
| 不快 | ふかい | unpleasant, displeasure, discomfort |
| 快速 | かいそく | high speed, celerity, mobility, express (train that bypasses many stations) |
| 快調 | かいちょう | harmony, excellent condition |
| 不愉快 | ふゆかい | discomfort, unpleasantness, disagreeableness, unhappiness |
