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dubious

[doo-bee-uh s, dyoo-] /ˈdu bi əs, ˈdyu-/
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
1540-1550
1540-50; < Latin dubius; see -ous
Related forms
dubiously, adverb
dubiousness, noun
superdubious, adjective
superdubiously, adverb
superdubiousness, noun
undubious, adjective
undubiously, adverb
undubiousness, noun
Synonyms
1. equivocal, ambiguous, obscure, unclear. 4. undecided, uncertain, hesitant, fluctuating. See doubtful.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un dubious

dubious

/ˈdjuːbɪəs/
adjective
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
Derived Forms
dubiously, adverb
dubiousness, noun
Word Origin
C16: from Latin dubius wavering
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for un dubious
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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