# fiendish

> English word · Adjective · IPA /ˈfiːndɪʃ/ · frequency rank #55,435

## Definitions
1. Sinister; evil; like a fiend.
2. Very difficult.

## Etymology
From fiend + -ish.

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