Etymology
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unassailable (adj.)

1590s, from un- (1) "not" + assailable (see assail (v.)). Related: Unassailably.

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Definitions of unassailable

unassailable (adj.)
immune to attack; incapable of being tampered with;
Synonyms: impregnable / inviolable / secure / strong / unattackable
unassailable (adj.)
impossible to assail;
Synonyms: untouchable
unassailable (adj.)
without flaws or loopholes;
Synonyms: unshakable / watertight / bulletproof
From wordnet.princeton.edu