What is the meaning of unfastened?

verb

• Cause to become undone.
  • usage: "unfasten your belt"
  • synonyms: unfasten
• Become undone or untied.
  • usage: "The shoelaces unfastened"
  • synonyms: unfasten

adjective

• Not closed or secured.
  • usage: "the car door was unfastened"; "unfastened seatbelts"
• Affording unobstructed entrance and exit; not shut or closed.
  • usage: "an open door"; "they left the door open"
  • synonyms: open
• Not buttoned.
  • usage: "the wind picked up the hem of her unbuttoned coat"
  • synonyms: unbuttoned
• Not tied.
  • synonyms: untied