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

miscreance†; infidelity &c (irreligion) 989 [Obs.]; dissent &c 489; change of opinion &c 484; retraction &c 607. doubt &c (uncertainty) 475; skepticism, scepticism, misgiving, demure; distrust, mistrust, cynicism; misdoubt†, suspicion, jealousy, scruple, qualm; onus probandi [Lat.]. incredibility, incredibleness; incredulity. [person who doubts] doubter, skeptic, cynic.; unbeliever &c 487. V. disbelieve, discredit; not believe &c 484; misbelieve†; refuse to admit &c (dissent) 489; refuse to believe &c (incredulity) 487. doubt; be doubtful &c (uncertain) 475; doubt the truth of; be skeptical as to &c adj.; diffide†; distrust, mistrust; suspect, smoke, scent, smell a rat; have doubts, harbor doubts, entertain doubts, suspicions; have one's doubts. demure, stick at, pause, hesitate, scruple; stop to consider, waver. hang in suspense, hang in doubt. throw doubt upon, raise a question; bring in, call in question; question, challenge, dispute; deny &c 536; cavil; cause a doubt, raise a doubt, start a doubt, suggest a doubt, awake a doubt, make suspicion; ergotize†. startle, stagger; shake one's faith, shake one's belief, stagger one's faith, stagger one's belief. Adj. unbelieving; skeptical, sceptical. incredulous as to, skeptical as to; distrustful as to, shy as to, suspicious of; doubting &c v.. doubtful &c (uncertain) 475; disputable; unworthy of, undeserving of belief &c 484; questionable; suspect, suspicious; open to suspicion, open to doubt; staggering, hard to believe, incredible, unbelievable, not to be believed, inconceivable; impossible &c 471. fallible &c (uncertain) 475; undemonstrable; controvertible &c (untrue) 495. Adv. cum grano salis [Lat.], with a grain of salt; with grains of allowance. Phr. fronti nulla fides [Lat.]; nimium ne crede colori [Lat.] [Vergil]; timeo Danaos et dona ferentes [Vergil], I fear the Greeks even when bearing gifts, beware of Greeks bearing gifts; credat Judaeus Apella [Lat.] [Horace]; let those believe who may; ad tristem partem stenua est suspicio [Lat.] [Syrus].