Etymology

treasonous

T1R1E1A1S1O1N1O1U1S1

Today it means: Like or in the way of treason. Full definition →

Proto-Indo-European *h₃édosder.? ← English treason
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The story

  1. Englishtreason
  2. Proto-Indo-European*h₃ed-
  3. Proto-Indo-European*h₃édosder.?
  4. English todaytreasonous

From treason + -ous.

Etymology from Wiktionary, CC BY-SA 4.0.