千慮一失
  せんりょいっしつ
  せんりょのいっしつ
  noun (common) (futsuumeishi)
  mere slip by someone who is usually very careful
  simple mistake by a wise person
  point overlooked by a cautious person
  ◄ ►
  千慮の一失
  せんりょのいっしつ
  noun (common) (futsuumeishi)
  the mistake of a wise man
  ◄ ►