Etymology

fiendy

F4I1E1N1D2Y4

Today it means: Like a fiend; fiendish Full definition →

Middle English feendy
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The story

  1. Middle English · inherited fromfeendy
  2. English todayfiendy

From Middle English feendy, fendi, equivalent to fiend + -y.

Etymology from Wiktionary, CC BY-SA 4.0.