Etymology

misbehaviour

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English behaviour ← Middle English mys- ← Old English mis-
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The story

  1. Proto-Indo-European*mey-?
  2. Proto-Indo-European*meyth₂-
  3. Proto-Germanic*missaz
  4. Proto-Germanic*missa-
  5. Proto-West Germanic*missa-
  6. Old Englishmis-
  7. Middle Englishmys-
  8. Englishmis-
  9. Englishbehaviour
  10. English todaymisbehaviour

From mis- + behaviour.

Etymology from Wiktionary, CC BY-SA 4.0.