Dictionary.com Unabridged


verb (used with object)
to free (buttons) from buttonholes; unfasten or undo.
to unfasten by or as if by unbuttoning: to unbutton a jacket.
to disclose (one's feelings, thoughts, etc.) after deliberate or prolonged silence.
verb (used without object)
to unfasten a button or one's buttons.

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

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unbutton (ʌnˈbʌtən)
1.  to undo by unfastening (the buttons) of (a garment)
2.  informal to release or relax (oneself, tension, etc)

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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 14c., from un- (2) + button (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Your guide will require this, but you should not try to sneak anything past
  him, such as keeping the life preserver unbuttoned.
Wei shrugs, gets up and leaves the flat to saunter through his neighborhood in
  his plastic sandals and unbuttoned shirt.
If you have to carry your wallet in an unbuttoned jacket, coat or pants pocket,
  be sure it holds only what you can afford to lose.
Only the top button of the uniform shirt may be unbuttoned if a tie is not worn.
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