Compounds of 油断

• 油断
  (n,vs) negligence
  unpreparedness
  (P)
• 油断大敵
  (exp) Unpreparedness is one's greatest enemy
  He that is too secure is not safe
• 油断も隙もない
  (exp) one must constantly be on one's guard with ...
  one cannot be too careful of ...
• 油断も隙も無い
  (exp) one must constantly be on one's guard with ...
  one cannot be too careful of ...