Roget's Thesaurus of English Words and Phrases by Peter Mark Roget

487. Incredulity — N. incredulousness†, incredulity; skepticism,

pyrrhonism†; want of faith &c (irreligion) 989 [Obs.]. suspiciousness &c adj.; scrupulosity; suspicion &c (unbelief) 485. mistrust, cynicism. unbeliever, skeptic, cynic; misbeliever.1, pyrrhonist; heretic &c (heterodox) 984. V. be incredulous &c adj.; distrust &c (disbelieve) 485; refuse to believe; shut one's eyes to, shut one's ears to; turn a deaf ear to; hold aloof, ignore, nullis jurare in verba magistri [Lat.]. Adj. incredulous, skeptical, unbelieving, inconvincible†; hard of belief, shy of belief, disposed to doubt, indisposed to believe; suspicious, scrupulous, distrustful, cynical;