Dictionary.com

fiendish

[ feen-dish ]
/ ˈfin dɪʃ /
Save This Word!
See synonyms for: fiendish / fiendishly / fiendishness on Thesaurus.com

adjective
diabolically cruel and wicked.
QUIZ
WILL YOU SAIL OR STUMBLE ON THESE GRAMMAR QUESTIONS?
Smoothly step over to these common grammar mistakes that trip many people up. Good luck!
Question 1 of 7
Fill in the blank: I can’t figure out _____ gave me this gift.

Origin of fiendish

First recorded in 1520–30; fiend + -ish1

OTHER WORDS FROM fiendish

fiend·ish·ly, adverbfiend·ish·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use fiendish in a sentence

British Dictionary definitions for fiendish

fiendish
/ (ˈfiːndɪʃ) /

adjective
of or like a fiend
diabolically wicked or cruel
informal extremely difficult or unpleasanta fiendish problem

Derived forms of fiendish

fiendishly, adverbfiendishness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
FEEDBACK