Compounds of くない

• いくない
  (exp,adj-i) not good (improper conjugation)
• 凄くない
  (exp) (uk) cool! (only when said or written in a questioning tone)
  incredible
  unbelievable
• お安くない
  (exp) on very good terms with each other
  romantically attached
• らしくない
  (adj-i) unusual
  different
• 芳しくない
  (adj-i) poor
  unfavourable
  unfavorable
  disgraceful
• にかたくない
  (exp) not hard to... (in certain circumstances, it would be possible)
• 行きたくない
  (adj-i) do not want to go
• 残りすくない
  (adj-i) scarce
  few remaining
• 思わしくない
  (adj-i) disappointing
  unsatisfactory
  unsuitable
• 糞面白くない
  (adj-i) totally uninteresting
• それっぽくない
  (exp) It isn't like the real thing
  It isn't authentic
• 想像に難くない
  (exp) easy to imagine
• 余り面白くない
  (adj-i) not very interesting
• 目に入れても痛くない
  (exp) thinking the sun shines out of someone's eyes
  being the apple of one's eye
• 赤信号皆で渡れば怖くない
  (exp) "If everyone crosses against the red light, then there's nothing to be afraid of"
• 目の中に入れても痛くない
  (exp) thinking the sun shines out of someone's eyes
  being the apple of one's eye