What is the meaning of overlooked?

verb

• Look past, fail to notice.
  • synonyms: overlook
• Be oriented in a certain direction.
  • usage: "The house looks out on a tennis court"; "The apartment overlooks the Hudson"
  • synonyms: look out on, look out over, overlook, look across
• Leave undone or leave out.
  • usage: "How could I miss that typo"; "The workers on the conveyor belt miss one out of ten"
  • synonyms: neglect, pretermit, omit, drop, miss, leave out, overlook, overleap
• Look down on.
  • usage: "The villa dominates the town"
  • synonyms: dominate, command, overlook, overtop
• Watch over.
  • usage: "I am overlooking her work"
  • synonyms: overlook

adjective

• Not taken into account.
  • usage: "his retirement was not allowed to go unmarked"
  • synonyms: unmarked, unnoted