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

1540–50; < Latin dubius; see -ous

dubiously, adverb
dubiousness, noun
superdubious, adjective
superdubiously, adverb
superdubiousness, noun
undubious, adjective
undubiously, adverb
undubiousness, noun

1. equivocal, ambiguous, obscure, unclear. 4. undecided, uncertain, hesitant, fluctuating. See doubtful.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dubious (ˈdjuːbɪəs)
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]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

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
As you dubiously contemplate your bulging midsection, such a pronouncement may
  seem a bit sweeping.
Many government contracts are still awarded dubiously.
The sergeant looks at them dubiously and then takes the box.
They dubiously presume that each piece of software pirated equals a direct loss
  of revenue to software firms.
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