Etymology

inarguably

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Today it means: Certainly; without the possibility of argument or debate. Full definition →

English inarguable ← Middle English arguen ← Old French arguer
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The story

  1. Proto-Indo-European*né
  2. Proto-Indo-European*n̥-
  3. Proto-Italic*n̥-
  4. Latinin-
  5. Middle Englishin-
  6. Englishin-
  7. Proto-Indo-European*h₂erǵ-
  8. Proto-Indo-European*h₂érǵus
  9. Proto-Italic*argusder.?
  10. Latinarguō
  11. Old Frencharguer
  12. Middle Englisharguen
  13. Englishargue
  14. Englisharguable
  15. Englishinarguable
  16. English todayinarguably

From inarguable + -ly.

Etymology from Wiktionary, CC BY-SA 4.0.