| Adj. | 1. | unfastened - not closed or secured; "the car door was unfastened"; "unfastened seatbelts" Antonyms: fastened - firmly closed or secured; "found the gate fastened"; "a fastened seatbelt" |
| 2. | unfastened - affording unobstructed entrance and exit; not shut or closed; "an open door"; "they left the door open" Synonyms: open | |
| 3. | unfastened - not buttoned; "the wind picked up the hem of her unbuttoned coat" Synonyms: unbuttoned | |
| 4. | unfastened - not tied Synonyms: untied |