# perfidious

> English word · Adjective · IPA /pɚˈfɪdi.əs/ · frequency rank #85,638

## Definitions
1. Of, pertaining to, or representing perfidy; disloyal to what should command one's fidelity or allegiance.

## Etymology
From Latin perfidiōsus (“treacherous”), from perfidia.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/perfidious