unfastened

adjectives

not closed or secured
"the car door was unfastened"; "unfastened seatbelts"
unfastened
antonym
fastened
is similar to
not firmly fastened or secured
"an unbarred door"; "went through the unlatched gate into the street"; "an unlocked room"
unbarred, unbolted, unlatched, unlocked, unsecured
is similar to
not fastened or tied or secured
"her blouse had come undone at the neck"; "his shoelaces were undone"
undone
affording unobstructed entrance and exit; not shut or closed
"an open door"; "they left the door open"
open, unfastened
not buttoned
"the wind picked up the hem of her unbuttoned coat"
unbuttoned, unfastened
not tied
unfastened, untied