fiendish
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Learner's definition of FIENDISH
[more fiendish; most fiendish]
1
:
very evil or cruel
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a fiendish murderer
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He takes a fiendish delight in hurting people.
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a fiendish contraption
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a fiendish [=diabolical] plot to destroy the world
2
:
extremely bad, unpleasant, or difficult
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fiendish weather
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a fiendish problem
— fiendishly
adverb-
a fiendishly clever plot
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a fiendishly hot sun
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a fiendishly coldhearted murderer
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fiendishly complex tools and machinery
— fiendishness
noun [noncount]-
a plot of incredible fiendishness
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