1. (adj) impregnable, inviolable, secure, strong, unassailable, unattackable
immune to attack; incapable of being tampered with
Synonyms: conceptive, potent, watertight, dependable, safe, absolute, substantial, inviolate, untroubled, inviolable, unshakable, untouchable, warm, good, stiff, inexpugnable, unafraid, infrangible, unattackable, unassailable, bulletproof, firm, solid, strong, sacrosanct, hard, impregnable, secure
Antonyms: contestable, vulnerable, violable
2. (adj) unassailable, untouchable
impossible to assail
Synonyms: inviolable, watertight, unshakable, bulletproof, unprocurable, strong, untouchable, unattackable, unassailable, impregnable, inaccessible, secure, unobtainable
Antonyms: vulnerable, violable, contestable
3. (adj) unassailable, unshakable, watertight, bulletproof
without flaws or loopholes
Synonyms: unbendable, bulletproof, stiff, inviolable, unshakable, unfaltering, untouchable, watertight, steadfast, unwavering, unassailable, steady, firm, strong, unattackable, impregnable, secure
Antonyms: contestable, vulnerable, violable
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Synonyms and Antonyms of unassailable 
