Etymology

indubiously

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Today it means: Synonym of without a doubt. Full definition →

English indubious ← Latin indubius ← Proto-Italic *du(i)βwos
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The story

  1. Proto-Indo-European*né
  2. Proto-Indo-European*n̥-
  3. Proto-Italic*n̥-
  4. Latinin-
  5. Proto-Indo-European*dwóh₁
  6. Proto-Indo-European*dwi-
  7. Proto-Indo-European*bʰuH-
  8. Proto-Italic*du(i)βwos
  9. Latin*dubosde
  10. Latindubius
  11. Latinindubius
  12. Englishindubious
  13. English todayindubiously

From indubious + -ly. First attested in the 17th century.

Etymology from Wiktionary, CC BY-SA 4.0.