THESAURUS
inconvincible
cautious, disinclined to believe, disposed to doubt, guarded, hard of belief, impervious to persuasion, incredulous, leery, shy of belief, skeptical, suspecting, suspicious, unconvincible, uncredulous, unpersuadable, unpersuasible, unwilling to accept, wary
ROGET THESAURUS
inconvincible
Incredulity
N
incredulousness, incredulity, skepticism, pyrrhonism, want of faith, suspiciousness, scrupulosity, suspicion, mistrust, cynicism, unbeliever, skeptic, cynic, misbeliever, pyrrhonist, heretic, incredulous, skeptical, unbelieving,
inconvincible, hard of belief, shy of belief, disposed to doubt, indisposed to believe, suspicious, scrupulous, distrustful, cynical.