timesharing has been brought into disrepute by dubious sales methods
Of questionable value
she earned the dubious distinction of being the lowest-paid teacher in the nation
doubtful: fraught with uncertainty or doubt; "they were doubtful that the cord would hold"; "it was doubtful whether she would be admitted"; "dubious about agreeing to go"
doubtful: open to doubt or suspicion; "the candidate's doubtful past"; "he has a dubious record indeed"; "what one found uncertain the other found dubious or downright false"; "it was more than dubitable whether the friend was as influential as she thought"- Karen Horney
not convinced; "they admitted the force of my argument but remained dubious"
(dubiously) questionably: in a questionable and dubious manner; "these were estates his father questionably acquired"
(dubiousness) doubt: the state of being unsure of something
Doubt, a status between belief and , involves uncertainty or distrust or lack of sureness of an alleged fact, an action, a motive, or a decision. ...
Arousing doubt; questionable; open to suspicion; In disbelief; wavering, uncertain, or hesitating in opinion; inclined to doubt; undecided
(dubiously) in a dubious manner; accompanied by doubt
(dubiosity) The state or characteristic of being dubious
du·bi·ous (dˇąbę-es, dyˇą-) adjective 1. Fraught with uncertainty or doubt; undecided. 2. Arousing doubt; doubtful: a dubious distinction. 3. Of questionable character: dubious profits. [From Latin dubius.] . duąbi·ous·ly adverb. duąbi·ous·ness noun