Noun
Want of faith or belief in some religious system; especially, a want of faith in, or disbelief of, the inspiration of the Scriptures, of the divine origin of Christianity.
Unfaithfulness to the marriage vow or contract; violation of the marriage covenant by adultery.
Breach of trust; unfaithfulness to a charge, or to moral obligation; treachery; deceit; as, the infidelity of a servant.
Source: Webster's dictionaryBut it is necessary to the happiness of man, that he be mentally faithful to himself. Infidelity does not consist in believing, or in disbelieving; it consists in professing to believe what he does not believe. Thomas Paine
Division has done more to hide Christ from the view of all men than all the infidelity that has ever been spoken. George MacDonald
It will not do to investigate the subject of religion too closely, as it is apt to lead to infidelity. Abraham Lincoln
It was no longer her absence that wounded me, but my growing indifference to it. Forgetting, however calming, was also a reminder of infidelity to what I had at one time held so dear. Alain de Botton
Physical infidelity is the signal, the notice given, that all fidelities are undermined. Katherine Anne Porter
Each husband gets the infidelity he deserves. American Proverb