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Definition of
fiendishly adverb
from the Oxford Advanced American Dictionary
fiendishly
adverb
adverb
NAmE
/
/
ˈfindɪʃli
/
/
(
informal
)
jump to other results
very; extremely
fiendishly clever/complicated
See
fiendishly
in the Oxford Advanced Learner's Dictionary
Check pronunciation:
fiendishly
Nearby words
fiend
noun
fiendish
adjective
fiendishly
adverb
fierce
adjective
fiery
adjective