Etymology

unobservable

U1N1O1B3S1E1R1V4A1B3L1E1

Today it means: That cannot be observed. Full definition →

English observable ← 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. Englishobserve
  9. Englishobservable
  10. English todayunobservable

From un- + observable.

Etymology from Wiktionary, CC BY-SA 4.0.