# fiendishly

> English word · Adverb · IPA /ˈfiːndɪʃli/ · frequency rank #91,500

## Definitions
1. In a fiendish manner; evilly, wickedly.
2. Extremely, very in harsh or negative contexts.

## Etymology
From fiendish + -ly.

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