"unfastened" in the verb sense
1. unfasten
cause to become undone
"unfasten your belt"
2. unfasten
become undone or untied
"The shoelaces unfastened"
"unfastened" in the adjective sense
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
Source: WordNet® (An amazing lexical database of English)
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