WordReference Random House Learner's Dictionary of American English © 2015
du•bi•ous /ˈdubiəs, ˈdyu-/USA pronunciation   adj. 
    1. of doubtful quality;
      questionable:dubious friends.
    1. unsure; uncertain in opinion;
      hesitant:dubious about our chances of success.
du•bi•ous•ly, adv. 

WordReference Random House Unabridged Dictionary of American English © 2015
du•bi•ous  (do̅o̅bē əs, dyo̅o̅-), 
    1. doubtful;
      marked by or occasioning doubt:a dubious reply.
    1. of doubtful quality or propriety; questionable:a dubious compliment;
      a dubious transaction.
    1. of uncertain outcome:in dubious battle.
    1. wavering or hesitating in opinion;
      inclined to doubt.
  • Latin dubius; see -ous
  • 1540–50
dubi•ous•ly, adv. 
dubi•ous•ness, n. 
1 . equivocal, ambiguous, obscure, unclear. 4 . undecided, uncertain, hesitant, fluctuating. See doubtful. 

Collins Concise English Dictionary © HarperCollins Publishers::

dubious /ˈdjuːbɪəs/ 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
Etymology: 16th Century: from Latin dubius wavering

ˈdubiously adv ˈdubiousness n

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