Definition of dubious adjective from the Oxford Advanced American Dictionary

     

    dubious

     adjective
    adjective
    NAmE//ˈdubiəs//
     
     
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  1. 1[not usually before noun] dubious (about something)/(about doing something) (of a person) not certain and slightly suspicious about something; not knowing whether something is good or bad synonym doubtful I was pretty dubious about the whole idea.
  2. 2(disapproving) probably not honest synonym suspicious They indulged in some highly dubious business practices to obtain their current position in the market.
  3. 3 that you cannot be sure about; that is probably not good They consider the plan to be of dubious benefit to most families. (ironic) She had the dubious honor of being chosen to head a failing company (= it was not an honor at all).
 
adverb
See the Oxford Advanced Learner's Dictionary entry: dubious