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
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
快調【かいちょう】
good (condition), going well, fine, smooth
快感【かいかん】
pleasant feeling, pleasant sensation, pleasure
快晴【かいせい】
clear weather, cloudless weather, good weather
快い【こころよい】
pleasant, agreeable, comfortable, refreshing
快勝【かいしょう】
sweeping victory, easy victory
快楽【かいらく】
pleasure, supreme pleasure obtained by freeing oneself from earthly desires
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
快投【かいとう】
good pitch
快音【かいおん】
pleasant sound, pleasing sound, crack (of a baseball bat), (pleasant) roar (of an engine)
爽快【そうかい】
refreshing, exhilarating, invigorating, bracing
快活【かいかつ】
cheerful, lively, lighthearted
快作【かいさく】
splendid work, masterpiece
快方【かいほう】
convalescence
