fiendish - WordReference.com Dictionary of English

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fiendish

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Concise Oxford English Dictionary © 2008 Oxford University Press:
fiendish/ˈfiːndɪʃ/

▶adjective

1 extremely cruel or unpleasant.

2 informal extremely complex.

– derivatives
fiendishly adverb,
fiendishness noun.

'fiendish' also found in these Oxford entries:

Mephistophelian

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