The quality of being unfaithful.

synonym: unfaithfulness.

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 940: improbity^†; dishonesty, dishonor; deviation from rectitude; disgrace etc. (disrepute) 874; fraud etc. (deception) 545; lying etc. 544; bad faith, Punic faith; mala fides [Lat.], Punica fides [Lat.]; infidelity; faithlessness etc. adj.; Judas kiss, betrayal.    breach of promise, breach of trust, breach of faith; prodition^†, disloyalty, treason, high treason; apostasy etc. (tergiversation) 607; nonobservance etc. 773.    shabbiness etc. adj.; villainy, villany^†; baseness etc. adj.; abjection, debasement, turpitude, moral turpitude, laxity, trimming, shuffling.    perfidy; perfidiousness etc. adj.; treachery, double dealing; unfairness etc. adj.; knavery, roguery, rascality, foul play; jobbing, jobbery; graft, bribery; venality, nepotism; corruption, job, shuffle, fishy transaction; barratry, sharp practice, heads I win tails you lose; mouth honor etc. (flattery) 933.    ... 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: ontrouw
Polish: wiarołomstwo, niewierność