Etymology

felonious

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Today it means: Of, relating to, being, or having the quality of felony. Full definition →

Middle English *felonious
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The story

  1. Middle English · inherited from*felonious
  2. English todayfelonious

From Middle English *felonious (implied in feloniously; compare felonous); equivalent to felony + -ous.

Etymology from Wiktionary, CC BY-SA 4.0.