Etymology

unmistakeable

U1N1M3I1S1T1A1K5E1A1B3L1E1
English mistakeable ← 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. Englishmistakeable
  9. English todayunmistakeable

From un- + mistakeable.

Etymology from Wiktionary, CC BY-SA 4.0.