Synonyms for dubious

Similarity of adj dubious

3 senses of dubious

Sense 1:

doubtful, dubious
uncertain (vs. certain), unsure (vs. sure), incertain

Sense 2:

doubtful, dubious, dubitable, in question(predicate)
questionable (vs. unquestionable)

Sense 3:

dubious
unconvinced (vs. convinced)