unassailable
1. without flaws or loopholes - an ironclad contract - a watertight alibi - a bulletproof argument • Syn: unshakable, watertight, bulletproof • Similar to: incontestable, incontestible 2. immune to attack; incapable of being tampered with - an impregnable fortress - fortifications that made the frontier inviolable - a secure telephone connection • Syn: impregnable, inviolable, secure, strong, unattackable • Similar to: invulnerable • Derivationally related forms: impregnability (for: impregnable), secureness (for: secure) 3. impossible to assail • Syn: untouchable • Similar to: inviolable
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