[adj] not tied
[adj] not buttoned; "the wind picked up the hem of her unbuttoned coat"
[adj] affording unobstructed entrance and exit; not shut or closed; "an open door"; "they left the door open"
[adj] not closed or secured; "the car door was unfastened"; "unfastened seatbelts"
ajar(p), open, open-collared, unbarred, unbolted, unbuttoned, undone, unlatched, unlocked, unsecured, untied, wide-open