Etymology

unmistakable

U1N1M3I1S1T1A1K5A1B3L1E1

Today it means: Unique, such that it cannot be mistaken for something else. Full definition →

English mistake ← 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. Englishmistake
  9. English todayunmistakable

From un- + mistake + -able.

Etymology from Wiktionary, CC BY-SA 4.0.