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unbuttoned

Something that's unbuttoned isn't closed or fastened. Your unbuttoned sweater won't keep you very warm on a cold, windy day.

The adjective unbuttoned is what you need when you're talking about a piece of clothing with buttons that aren't fastened, like your unbuttoned wool coat or your unbuttoned, rolled-up shirt sleeves. You can also describe a relaxed or uninhibited person as unbuttoned: "My mom is kind of uptight today, but on the weekends she's way more unbuttoned."

Definitions of unbuttoned
  1. adjective
    not buttoned
    “the wind picked up the hem of her unbuttoned coat”
    synonyms: unfastened
    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
    show more antonyms...
  2. adjective
    not under constraint in action or expression
    “"this unbuttoned and disrespectful age"- Curtis Bok”
    synonyms: unlaced
    unrestrained
    not subject to restraint
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