Etymology

unreactive

U1N1R1E1A1C3T1I1V4E1

Today it means: Not reactive; relatively inert. Full definition →

English reactive ← Middle English acte ← Old French act
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The story

  1. Proto-Indo-European*né
  2. Proto-Indo-European*n̥-
  3. Proto-Germanic*un-
  4. Proto-West Germanic*un-
  5. Old Englishun-
  6. Middle Englishun-
  7. Englishun-
  8. Proto-Italic*wre-
  9. Latinre-
  10. Old Frenchre-
  11. Middle Englishre-
  12. Englishre-
  13. Proto-Indo-European*h₂eǵ-
  14. Proto-Indo-European*h₂éǵeti
  15. Proto-Italic*agō
  16. Latinagō
  17. Latināctus
  18. Latinācta
  19. Old Frenchact
  20. Middle Englishacte
  21. Englishact
  22. Englishreact
  23. Englishreactive
  24. English todayunreactive

From un- + reactive.

Etymology from Wiktionary, CC BY-SA 4.0.