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.

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"