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Synonyms
un·as·sail·a·ble (ŭńə-sā́lə-bəl)

adjective 

  1. Impossible to dispute or disprove; undeniable: unassailable truths.
  2. Not subject to attack or seizure; impregnable: an unassailable fortress.

derivatives

uńas·saiĺa·biĺi·ty
noun
uńas·saiĺa·bly
adverb