Compounds of 快

• 快弁
  (n) eloquence
• 快報
  (n) good news
• 快方
  (n) convalescence
• 快味
  (n) pleasure
• 快眠
  (n,vs) pleasant sleep
• 快癒
  (n,vs) recovery
  convalescence
• 快腕
  (iK) (n) remarkable ability
  amazing ability
• 快闊
  (adj-na) cheerful
  lively
  lighthearted
• 欣快
  (adj-na,n) pleasant
  delightful
• 軽快
  (adj-na) (1) casual (e.g. dress)
  light
  nimble
  jaunty
  rhythmical (e.g. melody)
  (n,vs) (2) taking a turn for the better
  receding of symptoms
  (P)
• 豪快
  (adj-na,n) hearty
  exciting
  stirring
  lively
  heroic
  largehearted
  splendid
  (P)
• 全快
  (n,vs) complete recovery of health
  (P)
• 壮快
  (adj-na,n) emotionally uplifting
  stirring
• 爽快
  (adj-na,n) refreshing
  exhilarating
• 痛快
  (adj-na,n) intense pleasure
  thrilling
• 特快
  (n) special fast (local) train
• 不快
  (adj-na,n) unpleasant
  displeasure
  discomfort
  (P)
• 明快
  (adj-na,n) clarion
  clarity
  (P)
• 愉快
  (adj-na,n) pleasant
  happy
  (P)
• 快楽説
  (n) hedonism
• 快記録
  (n) fine record
• 快削鋼
  (n) free-cutting steel
• 快速船
  (n) fast ship
• 快男子
  (n) agreeable fellow
• 快男児
  (n) nice guy
• 快適さ
  (n) amenity
• 新快速
  (n) limited express (train, faster than an express)
• 不快感
  (n) discomfort
• 不愉快
  (adj-na,n) discomfort
  unpleasantness
  disagreeableness
  unhappiness
  (P)
• 愉快犯
  (n) criminal who takes delight in people's reaction to his crimes