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.
  2. unsure; uncertain in opinion;
    hesitant:dubious about our chances of success.
du•bi•ous•ly, adv. 


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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