unfastened

Anything unfastened is open or unbuttoned. If your dog frequently escapes through an unfastened gate in your backyard, you might want to buy a more secure latch.

When something is fastened, it's locked, hooked, tied, or otherwise secured. So when you undo whatever is securing it, it's unfastened. An unfastened seatbelt is a recipe for disaster, but an unfastened necktie or belt buckle can make you much more comfortable. If you have an unfastened clasp on your suspenders, your pants might fall down. (How embarrassing!)

Definitions of unfastened
  1. adjective
    not closed or secured
    “the car door was unfastened
    unfastened seatbelts”
    Synonyms:
    unbarred, unbolted, unlatched, unlocked, unsecured
    not firmly fastened or secured
    undone
    not fastened or tied or secured
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    Antonyms:
    fastened
    firmly closed or secured
    pegged-down
    fastened by pegs
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  2. adjective
    not buttoned
    synonyms: unbuttoned
    open-collared
    of a shirt; not buttoned at the neck
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    Antonyms:
    buttoned, fastened
    furnished or closed with buttons or something buttonlike
    botonee, botonnee
    (of a heraldic cross) having a cluster of three buttons or knobs at the end of each arm
    button-down
    of a shirt; having the ends of the collar fastened down by buttons
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  3. adjective
    not tied
    synonyms: untied
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    Antonyms:
    fastened, tied
    fastened with strings or cords
    knotted
    tied with a knot
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  4. adjective
    affording unobstructed entrance and exit; not shut or closed
    synonyms: open
    ajar
    slightly open
    wide-open
    open wide
    open
    affording free passage or access
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    Antonyms:
    closed, shut, unopen
    not open
    closed
    not open or affording passage or access
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