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Definition of dubious:

Doubtful or not settled in opinion; being in doubt; wavering or fluctuating; undetermined.
Occasioning doubt; not clear, or obvious; equivocal; questionable; doubtful; as, a dubious answer.
Of uncertain event or issue; as, in dubious battle.

Synonyms:

suspect, borderline, ambiguous, chancy, unconvinced, problematical, doubtful, hesitant, equivocal, in question, certain, dubitable, questionable, uncertain, indecisive, iffy, incertain, obscure, unclear, unclear, indecisive, enigmatic, problematic, enigmatical, indeterminate, indefinite, inconclusive, unsure, clouded, tentative, perplexing, undecided, indistinct, clear.

disreputable (part of speech: adjective)
- louche,
- shady,
- contemptible,
- nefarious,
- notorious,
- disreputable,
- shifty,
- infamous,
- risque,
- questionable,
- ribald,
- dishonorable
skeptical (part of speech: adjective)
- incredulous,
- doubtful,
- skeptical,
- suspicious,
- unbelieving,
- cynical
unreliable (part of speech: adjective)
ridiculous (part of speech: adjective)
- incredible,
- weird,
- outlandish,
- ludicrous,
- preposterous,
- eccentric,
- absurd,
- nonsensical,
- farcical,
- bizarre,
- oddball,
- crazy,
- foolish,
- comical,
- poppycock,
- ridiculous,
- silly,
- curious,
- outrageous,
- laughable,
- grotesque

Usage examples:

It is my intention to pursue the versification of Horace still further, but whether my plan shall be fulfilled is so very dubious that I set no store by it.

- "Eugene Field, A Study In Heredity And Contradictions", Slason Thompson.
One or two Jews and a half dozen Yankee traders, of hardly dubious honesty, comprised the entire white population.

- "Howard Pyle's Book of Pirates", Howard I. Pyle.
Yes, sir, we won out, though for a spell it looked pretty dubious.

- "The Depot Master", Joseph C. Lincoln.