perfidus.
that breaks one's promise; false; faithless; dishonest; disloyal; deceitful
Meaning & usage
that breaks one's promise; false; faithless; dishonest; disloyal; deceitful
treacherous; unsafe; dangerous
Where this word comes from
From per (“through; along”) + fidēs (“faith; trust”) + -us (adjectival suffix), based on the phrase per fidem dēcipere (“to deceive through faith”).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.