Etymology

unsustainable

U1N1S1U1S1T1A1I1N1A1B3L1E1

Today it means: Not sustainable. Full definition →

English sustainable ← Middle English un- ← 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. Englishsustain
  9. Englishsustainable
  10. English todayunsustainable

From un- + sustainable.

Etymology from Wiktionary, CC BY-SA 4.0.