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fiendish

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fiendish/ˈfiːndɪʃ/adjective
fiendish
/ˈfiːndɪʃ/
adjective
Learner's definition of FIENDISH  
[more fiendish; most fiendish]
: very evil or cruel
: extremely bad, unpleasant, or difficult

— fiendishly

adverb

— fiendishness

noun,[noncount]
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