Compounds of 不

• 寝不足
  (adj-na,n) lack of sleep
• 心不全
  (n) heart failure
  (P)
• 親不孝
  (adj-na,n) lack of filial piety
  (P)
• 親不知
  (n) wisdom tooth
• 腎不全
  (n) renal failure
• 水不足
  (n) water shortage
  shortage of water supply
• 大不敬
  (n) (1) (arch) great impropriety (esp. towards the imperial family)
  (2) crime against the imperial family (or a shrine dedicated to them, etc.)
• 適不適
  (n) suitability
• 筆不精
  (adj-na,n) poor correspondent
  apparent disdain of (or trouble with) writing
  someone who appears to dislike (or be poor at) writing
• 不愛想
  (adj-na,n) unsociability
  bluntness
• 不愛想
  (adj-na,n) unsociability
  bluntness
• 不安気
  (adj-na) uneasy
• 不安心
  (adj-na,n) uneasiness
  uncertainty
  anxiety
  apprehension
  restlessness
  insecurity
  suspense
  fear
• 不安定
  (adj-na,n) instability
  insecurity
  crankiness
  (P)
• 不案内
  (adj-na,n) ignorance
  inexperience
  unfamiliarity
• 不意に
  (adv) suddenly
  abruptly
  unexpectedly
  (P)
• 不意気
  (adj-na,n) vulgarity
  lack of refinement
• 不一致
  (n) discrepancy
  discord
  disagreement
  mismatch
  dissonance
• 不衛生
  (adj-na,n) unsanitary condition
  lack of hygienic care
  inattention to hygiene
  unhygienic conditions
• 不応期
  (n) refractory period
• 不穏当
  (adj-na,n) impropriety
  inappropriateness
  unfairness
  unreasonableness
• 不可解
  (adj-na,n) mystery
  baffling
  inexplicable
  incomprehensible
  (P)
• 不可逆
  (adj-na,n) irreversible
• 不可欠
  (adj-na,n) indispensable
  essential
  (P)
• 不可誤
  (n) (papal) infallibility
• 不可算
  (n) (ling) (abbr) uncountable
• 不可視
  (n,adj-no) invisibility
• 不可侵
  (n) inviolability
  sacredness
  nonaggression
  (P)
• 不可知
  (adj-na,n) unknowable
  mysterious
• 不可得
  (n) (Buddh) the unobtainable (that which cannot be known)