Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. secure against attack; impregnable
  • adj. undeniable, incontestable or incontrovertible

from The Century Dictionary and Cyclopedia

  • Not assailable; incapable of being assailed; incontestable; hence, not to be moved or shaken from a purpose.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. impossible to assail
  • adj. without flaws or loopholes
  • adj. immune to attack; incapable of being tampered with

Etymologies

un- +‎ assailable (Wiktionary)

Examples

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