Synonym: unfaithfulness. Similar words: fidelity, infidel, confide, confident, confidence, infirmity, guideline, reliability. Meaning: [‚ɪnfɪ'delətɪ] 
n. the quality of being unfaithful.
n. the quality of being unfaithful. 
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61, A princess and sorceress of Colchis who helped Jason obtain the Golden Fleece, lived as his consort, and killed their children as revenge for his infidelity.
62, On the whole, though, they are tolerant of infidelity when it happens.
63, Men feel guiltier following sexual infidelity, while women feel worse after an emotional transgression--and both are incredibly self-involved.
64, Crassness, the nature and number of divorces and acts of infidelity, seem to matter. In fact, adultery may be the new divorce.
65, FRIDAY, June 24 (HealthDay News) -- A new study finds that the practice of "sexting" -- sending salacious texts or nude photos over the Internet -- is now a key tool for Americans bent on infidelity.
More similar words: fidelity, infidel, confide, confident, confidence, infirmity, guideline, reliability, infinite, bona fide, deliver, delight, diffident, delivery, delicate, delighted, delirious, indelible, widely, delightful, deliberate, deliberately, elite, polity, utility, agility, quality, ability, facility, viability.