The meaning of FIENDISH is perversely diabolical. How to use fiendish in a sentence.

Many fiendish creatures are pets or servants or spies or such of demons and devils.

1. Of, relating to, or suggestive of a fiend; diabolical. 2. Extremely wicked or cruel. 3. Extremely bad, disagreeable, or difficult: a fiendish blizzard; a fiendish problem.

Aug 30, 2025 · fiendish (comparative more fiendish, superlative most fiendish) The detective was puzzled by the fiendish plot to steal the diamonds. She had a fiendish smile that hinted at a …

fiendish meaning, definition, what is fiendish: cruel and unpleasant: Learn more.

FIENDISH definition: diabolically cruel and wicked. See examples of fiendish used in a sentence.

3 meanings: 1. of or like a fiend 2. diabolically wicked or cruel 3. informal extremely difficult or unpleasant.... Click for more definitions.

an extremely cruel or wicked person. Informal Terms a person who is addicted or very attached to some habit, practice, condition, etc.: a fiend for neatness. fiend (fēnd), n. the devil. demon. a …

FIENDISH meaning: 1 : very evil or cruel; 2 : extremely bad, unpleasant, or difficult

Definition of fiendish adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.