du·bi·ous 
(dbē-əs, dy-)
(dbē-əs, dy-)adj.
1. Fraught with uncertainty or doubt; undecided.
2. Arousing doubt; doubtful: a dubious distinction.
3. Of questionable character: dubious profits.
[From Latin dubius; see dwo- in the Appendix of Indo-European roots.]
dubi·ous·ly adv.
dubi·ous·ness n.