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noun [ U ] uk /ˈfiːn.dɪʃ.nəs/ us /ˈfiːn.dɪʃ.nəs/
(Definition of “fiendish” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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look like a million dollars
to look or feel extremely good, often because you are wearing something that costs a lot of money