Etymology

unassailable

U1N1A1S1S1A1I1L1A1B3L1E1

Today it means: Secure against attack; impregnable. Full definition →

English assailable ← 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. Englishassailable
  9. English todayunassailable

From un- + assailable.

Etymology from Wiktionary, CC BY-SA 4.0.