Doubt about the truth of something.

synonyms: disbelief, mental rejection, skepticism.

Roget 989: irreligion^†, indevotion^†; godlessness, ungodliness etc. adj.; laxity, quietism.    skepticism, doubt; unbelief, disbelief; incredulity, incredulousness etc. adj.^†; want of faith, want of belief; pyrrhonism; bout etc. 485; agnosticism.    atheism; deism; hylotheism^†; materialism; positivism; nihilism.    infidelity, freethinking, antichristianity^†, rationalism; neology.    [person who is not religious] atheist, skeptic, unbeliever, deist, infidel, pyrrhonist; giaour^†, heathen, alien, gentile, Nazarene; espri fort [Fr.], freethinker, latitudinarian, rationalist; materialist, positivist, nihilist, agnostic, somatist^†, theophobist^†.    ... show more

Roget 487: incredulousness^†, incredulity; skepticism, pyrrhonism^†; want of faith etc. (irreligion) 989^†.    suspiciousness etc. adj.; scrupulosity; suspicion etc. (unbelief) 485.    mistrust, cynicism.    unbeliever, skeptic, cynic; misbeliever.   1, pyrrhonist; heretic etc. (heterodox) 984.    ... show more

Roget 485: unbelief, disbelief, misbelief; discredit, miscreance^†; infidelity etc. (irreligion) 989^†; dissent etc. 489; change of opinion etc. 484; retraction etc. 607.    doubt etc. (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 etc. 487.    ... show more

Dutch: ongelovigheid, twijfelzucht, scepticisme, ongeloof
Polish: niewiara, zwątpienie