agnostic ambiguous capricious chancy changeable creedless dicey disbelieving doubting equivocal erratic faithless fickle heretical hesitant hesitating incalculable incredulous indecisive indemonstrable irreligious irresolute minimifidian nonbelieving nullifidian polysemous repudiative skeptical touch-and-go unaccountable unbelieving uncertain unconfident unconfirmable unconverted undivinable unforeseeable unpersuaded unpredictable unprovable unsure unverifiable variable wavering whimsical without faith