Etymology

erratic

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Today it means: Unsteady, random; prone to unexpected changes; not consistent. Full definition →

Middle English erratik ← Classical Latin errāticus ← Middle French erratique
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The story

  1. Proto-Indo-European*h₁ers-
  2. Proto-Indo-European*h₁erseh₂yéti
  3. Proto-Italic*ersāō?
  4. Latinerrō
  5. Classical Latinerrāticus
  6. Old Frencherratique
  7. Middle Frencherratique
  8. Classical Latinerrāticus
  9. Middle Englisherratik
  10. English todayerratic

From Middle English erratik, from Middle French erratique (from Old French erratique) and its etymon Classical Latin errāticus.

Etymology from Wiktionary, CC BY-SA 4.0.