Etymology

unbreathable

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Today it means: Not suitable for breathing. Full definition →

English breathable ← Middle English brethen ← Old English un-
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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. Middle Englishbreeth
  9. Middle Englishbrethen
  10. Englishbreathe
  11. Englishbreathable
  12. English todayunbreathable

From un- + breathable.

Etymology from Wiktionary, CC BY-SA 4.0.