adjective, unwiser, unwisest.
not wise; foolish; imprudent; lacking in good sense or judgment: an unwise choice; an unwise man.

before 900; Middle English; Old English unwīs. See un-1, wise1

unwisely, adverb
unwiseness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unwise (ʌnˈwaɪz)
lacking wisdom or prudence; foolish

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

O.E. unwis, from un- (1) "not" + wise. Cf. M.Du. onwijs, O.H.G. unwis, Ger. unweise, O.N. uviss, Goth. unweis. Unwisely is O.E. unwislice.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
All this white seems unwise, a potentially horrible canvas.
But nobody ever thought to stop us or suggest that it was perhaps unwise to be
  scampering through choking clouds of insecticide.
As always, it is unwise to make too much of one month's figures.
She would have liked to teach history, but being herself a footnote to history
  rendered that unwise.
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