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Definition of fiendishly

fiendishly

/ˈfiːn.dɪʃ.li/
fien · dish · ly
Adjective:fiendish
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fiendishly Lexical Profile

fiendishly Game Scores & Validity

• adverb

1

To an extreme, intense, or frustratingly high degree, especially regarding difficulty or complexity.

Example

"The professor designed a fiendishly clever puzzle that took the students several weeks to solve."

2

In a wicked, cruel, or malicious manner.

Example

"In the classic play, the villain plotted fiendishly against the unsuspecting royal family."

Synonyms
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Antonyms
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• Nearby Words

fieldworker
fiend
fiendish
fiendishly
fierce
fierce snake
fiercely

Word Origin & Etymology

Formed from the adjective 'fiendish' plus the adverbial suffix '-ly'. The root 'fiend' comes from Old English 'fēond', meaning an enemy or adversary, and later specifically the Devil or a demon.

Cite this Entry

Wordmom. (2026). Definition of Fiendishly. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/fiendishly
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