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Definition of fiendishly adverb from the Oxford Advanced Learner's Dictionary

fiendishly

adverb
 
/ˈfiːndɪʃli/
 
/ˈfiːndɪʃli/
(informal)
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  1. very; extremely
    • fiendishly clever/complicated
    Oxford Collocations DictionaryFiendishly is used with these adjectives:
    • clever
    • complicated
    See full entry
See fiendishly in the Oxford Advanced American Dictionary
Check pronunciation: fiendishly

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