Adjective unassailable has 3 senses
  1. impregnable, inviolable, secure, strong, unassailable, unattackable - able to withstand attack; "an impregnable fortress"; "fortifications that made the frontier inviolable"
    Antonym: vulnerable (indirect, via invulnerable)
  2. unassailable, untouchable - impossible to assail
    Antonym: violable (indirect, via inviolable)
  3. ironclad, unassailable, unshakable, watertight, bulletproof - without flaws or loopholes; "an ironclad contract"; "a watertight alibi"; "a bulletproof argument"
    Antonym: contestable (indirect, via incontestable)
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