1. (

• unfasten ,

) cause to become undone; "unfasten your belt" ;

2. (

• unfasten

) become undone or untied; "The shoelaces unfastened" ;

1. (

• unfastened

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

2. (

• open ,
• unfastened ,

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

3. (

• unbuttoned ,
• unfastened ,

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

4. (

• untied ,
• unfastened ,

) not tied ;