du·bi·ous

[doo-bee-uhs, dyoo-]
adjective
1.
doubtful; marked by or occasioning doubt: a dubious reply.
2.
of doubtful quality or propriety; questionable: a dubious compliment; a dubious transaction.
3.
of uncertain outcome: in dubious battle.
4.
wavering or hesitating in opinion; inclined to doubt.

Origin:
1540–50; < Latin dubius; see -ous

du·bi·ous·ly, adverb
du·bi·ous·ness, noun
su·per·du·bi·ous, adjective
su·per·du·bi·ous·ly, adverb
su·per·du·bi·ous·ness, noun
un·du·bi·ous, adjective
un·du·bi·ous·ly, adverb
un·du·bi·ous·ness, noun


1. equivocal, ambiguous, obscure, unclear. 4. undecided, uncertain, hesitant, fluctuating. See doubtful.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
dubious (ˈdjuːbɪəs) [Click for IPA pronunciation guide]
 
adj
1.  marked by or causing doubt: a dubious reply
2.  unsettled in mind; uncertain; doubtful
3.  of doubtful quality; untrustworthy: a dubious reputation
4.  not certain in outcome
 
[C16: from Latin dubius wavering]
 
'dubiously
 
adv
 
'dubiousness
 
n

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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Etymonline
Word Origin & History

dubious
1540s, from L. dubiosus "doubtful," from dubium "doubt," neuter of dubius "doubtful," from duo "two," in the sense of "of two minds, undecided between two things." O.E. also used tweo "two" to mean "doubt." Related: Dubiously.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Animal studies can sometimes be of dubious scientific value, since different
  species react differently to the same procedure.
Here are some conditions for which overseas clinics offer dubious solutions.
The quality of economic statistics is often dubious in developing countries,
  for example.
Moviegoers tended to watch the often dubious results with one eye closed and a
  slightly queasy feeling in their stomachs.
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