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Adjective: unfastened  ,ún'fã-sund
  1. Not closed or secured
    "the car door was unfastened"; "unfastened seatbelts"
  2. Affording unobstructed entrance and exit; not shut or closed
    "an unfastened door";
    - open
  3. Not buttoned
    "the wind picked up the hem of her unfastened coat";
    - unbuttoned
  4. Not tied
    - untied
Verb: unfasten  ,ún'fã-sun
  1. Cause to become undone
    "unfasten your belt"
  2. Become undone or untied
    "The shoelaces unfastened"

See also: ajar, open, open-collared, unbarred, unbolted, undone, unlatched, unlocked, unsecured, wide-open

Type of: open, open up, undo

Antonym: fasten, fastened