Etymology

unchallengeable

U1N1C3H4A1L1L1E1N1G2E1A1B3L1E1

Today it means: Not open to challenge; indisputable Full definition →

English challengeable ← 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. Englishchallengeable
  9. English todayunchallengeable

From un- + challengeable.

Etymology from Wiktionary, CC BY-SA 4.0.