from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Impossible to dispute or disprove; undeniable.
  • adjective Not subject to attack or seizure; impregnable.

from The Century Dictionary.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective secure against attack; impregnable
  • adjective by extension undeniable, incontestable or incontrovertible

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

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


from Wiktionary, Creative Commons Attribution/Share-Alike License

un- +‎ assailable


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