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dubious (adj.)

1540s, "puzzling, occasioning doubt or uncertainty;" 1630s, "doubtful, hesitating in opinion;" from Late Latin dubiosus "doubtful," from Latin dubium "doubt," neuter of dubius "vacillating, moving two ways, fluctuating;" figuratively "wavering in opinion, doubting, doubtful," from duo "two" (from PIE root *dwo- "two"), with a sense of "of two minds, undecided between two things." Old English also used tweo "two" to mean "doubt." Compare doubt (v.). Related: Dubiously; dubiousness.

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Definitions of dubious from WordNet

dubious (adj.)
open to doubt or suspicion; "it was more than dubitable whether the friend was as influential as she thought"- Karen Horney;
what one found uncertain the other found dubious or downright false
he has a dubious record indeed
Synonyms: doubtful / dubitable / in question
dubious (adj.)
fraught with uncertainty or doubt;
dubious about agreeing to go
Synonyms: doubtful
dubious (adj.)
not convinced;
they admitted the force of my argument but remained dubious
From wordnet.princeton.edu