1. unfasten, undo

usage: cause to become undone; "unfasten your belt"

2. unfasten, open, open up

usage: become undone or untied; "The shoelaces unfastened"


1. unfastened (vs. fastened), unbarred, unbolted, unlatched, unlocked, unsecured, undone

usage: not closed or secured; "the car door was unfastened"; "unfastened seatbelts"

2. open (vs. shut), unfastened, ajar(predicate), wide-open, open

usage: affording unobstructed entrance and exit; not shut or closed; "an open door"; "they left the door open"

3. unbuttoned (vs. buttoned), unfastened, open-collared

usage: not buttoned; "the wind picked up the hem of her unbuttoned coat"

4. untied (vs. tied), unfastened

usage: not tied

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