unbuttoned

UK: /ʌnˈbʌt^ənd/ US: (un but′nd)

WordReference Random House Unabridged Dictionary of American English © 2025

un•but•toned  (un but′nd), adj. 

1. not buttoned.
2. Informal Terms free, open, or informal;
   unrestrained:
   unbuttoned humor.

• unbutton + -ed² or un-¹ + buttoned 1575–85

Collins Concise English Dictionary © HarperCollins Publishers::

unbuttoned / ʌnˈbʌt^ənd/ adjective

1. with buttons not fastened
2. uninhibited; unrestrained: hours of unbuttoned self-revelation

WordReference Random House Learner's Dictionary of American English © 2025

un•but•ton /ʌnˈbʌtən/   v. [~ + object]

1. to unfasten or undo the buttons of (a piece of clothing).

WordReference Random House Unabridged Dictionary of American English © 2025

un•but•ton  (un but′n), v.t. 

1. to free (buttons) from buttonholes;
   unfasten or undo.
2. to unfasten by or as if by unbuttoning:
   to unbutton a jacket.
3. to disclose (one's feelings, thoughts, etc.) after deliberate or prolonged silence.

v.i. 

4. to unfasten a button or one's buttons.

• Middle English unbotenen. See un-², button 1275–1325

Collins Concise English Dictionary © HarperCollins Publishers::

unbutton / ʌnˈbʌt^ən/ verb

1. to undo by unfastening (the buttons) of (a garment)