Rejecting a specific religion. / Of, characteristic of, or relating to unbelievers or unbelief.

(now usually derogatory) One who does not believe in a certain religion. / (now usually derogatory) One who does not believe in a certain principle.

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.

plural of infidelity

plural of infidel

(Christianity, historical) Of a bishop: merely titular, without regular jurisdiction, and serving to assist some other bishop or to act as delegates of the pope where no hierarchy had yet been established.

Fear or hatred of infidels