1. unfasten - verb
· cause to become undone; "unfasten your belt"
Hypernym(s): undo
Antonym(s): fasten
2. unfasten - verb
· become undone or untied; "The shoelaces unfastened"
Antonym(s): fasten
3. unfastened - adjective
· not closed or secured; "the car door was unfastened"; "unfastened seatbelts"
Antonym(s): fastened
4. unfastened - adjective
· affording unobstructed entrance and exit; not shut or closed; "an open door"; "they left the door open"
Synonym(s): open
5. unfastened - adjective
· not buttoned; "the wind picked up the hem of her unbuttoned coat"
Synonym(s): unbuttoned
6. unfastened - adjective
· not tied
Synonym(s): untied
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