Etymology

involuntary

in·vol·un·ta·ry
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Today it means: Without intention; unintentional. Full definition →

English voluntary ← Middle English voluntarie ← Latin in-
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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. Middle Englishvoluntarie
  8. Englishvoluntary
  9. English todayinvoluntary

From in- + voluntary, from Late Latin involontarius, from in + volontarius.

Etymology from Wiktionary, CC BY-SA 4.0.