dubitable,
in question,
doubtful,
dubious 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"
equivocal uncertain as a sign or indication; "the evidence from bacteriologic analysis was equivocal"
suspect,
fishy,
suspicious,
funny,
shady not as expected; "there was something fishy about the accident"; "up to some funny business"; "some definitely queer goings-on"; "a shady deal"; "her motives were suspect"; "suspicious behavior"
