不快【ふかい】
displeasure, discomfort, unpleasantness, indisposition, ailment
快適【かいてき】
pleasant, agreeable, comfortable
不愉快【ふゆかい】
unpleasant, disagreeable, displeasing, uncomfortable, unhappy
愉快【ゆかい】
pleasant, delightful, enjoyable, joyful, cheerful, amusing, happy
軽快【けいかい】
light (of movements), nimble, sprightly, springy, light-hearted, cheerful, buoyant, jaunty, casual (e.g. clothing), rhythmical (e.g. melody), taking a turn for the better (of an illness), receding of symptoms, recovery, convalescence
快速【かいそく】
high speed, rapidity, rapid-service train (not as fast as express), rapid train
快い【こころよい】
pleasant, agreeable, comfortable, refreshing
快晴【かいせい】
clear weather, cloudless weather, good weather
快楽【かいらく】
pleasure, supreme pleasure obtained by freeing oneself from earthly desires
爽快【そうかい】
refreshing, exhilarating, invigorating, bracing
明快【めいかい】
clear, clear-cut, lucid, unequivocal, explicit
豪快【ごうかい】
hearty, tremendous, magnificent, glorious, splendid, heroic, stirring
快挙【かいきょ】
brilliant achievement, spectacular feat, splendid accomplishment, remarkable deed
快活【かいかつ】
cheerful, lively, lighthearted
快調【かいちょう】
good (condition), going well, fine, smooth
快感【かいかん】
pleasant feeling, pleasant sensation, pleasure
快勝【かいしょう】
sweeping victory, easy victory
快走【かいそう】
fast moving, fast running, fast sailing
痛快【つうかい】
exhilarating, thrilling, intensely pleasurable
快諾【かいだく】
ready consent