# treacherous

> English word · Adjective · IPA /ˈtɹɛt͡ʃəɹəs/ · frequency rank #19,235

## Definitions
1. Exhibiting treachery.
2. Deceitful; inclined to betray.
3. Unreliable; dangerous.

## Etymology
From Old French trecheros, tricheros (“deceitful”), equivalent to treacher + -ous. See treacher.

## Common misspellings (16)
`rteacherous`, `teracherous`, `traecherous`, `treaccherous`, `treacehrous`, `treacheorus`, `treacherosu`, `treacherouss`, `treacherrous`, `treacheruos`, `treachherous`, `treachreous`, `treahcerous`, `trecaherous`, `trreacherous`, `ttreacherous`

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