Definition fiendish in American English

fiendish adjective

adjective

/ˈfindɪʃ/

very evil

Example

a fiendish grin

Synonyms and related words

evil atrocious bad

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a fiendish plan or idea is very clever but cruel

Synonyms and related words

strategic tactical workable deterministic abstract central cruel unkind evil

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a fiendish problem or question is very difficult to solve or deal with

Synonyms and related words

difficult impossible trying

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