Possessed by or suggestive of a diabolical or devilish nature; fiendishly clever or wicked.
From French 'endiablé' (past participle of 'endiabler'), meaning 'possessed by the devil,' from 'en-' (in/into) plus 'diable' (devil). Originally described someone thought to be demon-possessed.
Shakespeare and his contemporaries loved this French import because it sounded theatrical and mysterious—saying someone was 'endiablee' was way more dramatic than just calling them 'wicked.'
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