perfidy C2+ Topic:Religion & Belief US /ˈpɝfədi/ UK /ˈpɜːfɪdi/ See IPA manual Meanings 1 noun deceitfulness; treachery or breach of faith His perfidy was revealed when he betrayed his closest ally. Thesaurus Synonyms 1 noun · deceitfulness; treachery or... treacherybetrayaldisloyaltyfaithlessnessduplicitydeceittreason ↔ Opposites loyaltyfidelityfaithfulnessallegiance Word family Derived forms perfidiousperfidiousness Related forms perfidiousfidelity Etymology AI details From Latin perfidia ('faithlessness, treachery'), from perfidus ('faithless'), from per- ('through, contrary to') + fides ('faith'). perfidia Latin perfidus Latin fides Latin View etymology graph -> Topics Religion & Belief Word Formation & Derivatives External links Cambridge Dictionary Wiktionary Google Images # perfidy **Type:** Word **Level:** C2+ **Part of speech:** noun **IPA (US):** /ˈpɝfədi/ **IPA (UK):** /ˈpɜːfɪdi/ ## Meanings 1. deceitfulness; treachery or breach of faith ## Examples - His perfidy was revealed when he betrayed his closest ally. ## Synonyms - treachery - betrayal - disloyalty - faithlessness - duplicity - deceit - treason ## Antonyms - loyalty - fidelity - faithfulness - allegiance ## Derived Forms - perfidious - perfidiousness ## Related Forms - perfidious - fidelity ## Roots and Affixes - Root: perfidia - Root: perfidus - Root: fides ## Etymology From Latin perfidia ('faithlessness, treachery'), from perfidus ('faithless'), from per- ('through, contrary to') + fides ('faith'). ## AI Etymology Perfidy is from Latin perfidia ('faithlessness, treachery'), from perfidus ('faithless'), from per- ('through, contrary to') + fides ('faith'). Important recorded forms include perfidia (Latin), perfidus (Latin), and fides (Latin). Morphologically, the word is a built form whose named elements carry part of the historical sense. The current sense covers deceitfulness; treachery or breach of faith. The wider family includes derived forms such as perfidious and perfidiousness and related words such as perfidious and fidelity. ## Topics - Religion & Belief - Word Formation & Derivatives markdown