Incredulous

a.	1.
	1.	Not credulous; indisposed to admit or accept that which is related as true, skeptical; unbelieving. A fantastical incredulous fool. - Bp. Wilkins.
	2.	Indicating, or caused by, disbelief or incredulity.
	3.	Incredible; not easy to be believed.

Adj.

1.

incredulous - not disposed or willing to believe; unbelieving Antonyms: credulous - disposed to believe on little evidence; "the gimmick would convince none but the most credulous"

Humean, Pyrrhonic, agnostic, cautious, creedless, disbelieving, disinclined to believe, disposed to doubt, distrustful, doubtful, doubting, dubious, faithless, guarded, hard of belief, heretical, hesitant, impervious to persuasion, inconvincible, irreligious, leery, minimifidian, mistrustful, nonbelieving, nullifidian, questioning, quizzical, repudiative, sceptical, shy of belief, skeptic, skeptical, suspecting, suspicious, unbelieving, uncertain, unconfident, unconverted, unconvinced, unconvincible, uncredulous, unpersuadable, unpersuasible, unsatisfied, unwilling to accept, wary, without faith