perfidy

C2+ Topic:Religion & Belief

US /ˈpɝfədi/ UK /ˈpɜːfɪdi/ See IPA manual

noun

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... treachery betrayal disloyalty faithlessness duplicity deceit treason

Opposites

loyalty fidelity faithfulness allegiance

Word family

Derived forms perfidious perfidiousness

Related forms perfidious fidelity

Etymology

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

# 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

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perfidy

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