INFIDELITY

infidelity, unfaithfulness

(noun) the quality of being unfaithful

Source: WordNet® 3.1

Etymology

Noun

infidelity (countable and uncountable, plural infidelities)

Unfaithfulness in a marriage or an intimate relationship: practice or instance of having a sexual or romantic affair with someone other than one's spouse, without the consent of the spouse.

Unfaithfulness in some other moral obligation.

Lack of religious belief.

Synonyms

• (marital): adultery

• (moral): betrayal

• (religious): faithlessness

Antonyms

• (moral): faithfulness

• (moral): loyalty

• (moral): fidelity

Source: Wiktionary

In`fi*del"i*ty, n.; pl. Infidelities (. Etym: [L. infidelitas: cf. F. infidélité.]

1. 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. There is, indeed, no doubt but that vanity is one of the principal causes of infidelity. V. Knox.

2. Unfaithfulness to the marriage vow or contract; violation of the marriage covenant by adultery.

3. Breach of trust; unfaithfulness to a charge, or to moral obligation; treachery; deceit; as, the infidelity of a servant. "The infidelity of friends." Sir W. Temple.

Source: Webster’s Unabridged Dictionary 1913 Edition