authenticity authoritativeness calculability deathlessness dependability faithworthiness firmness immortality impenetrability imperishability impregnability incorruptibility indelibility indestructibility indomitability ineffaceability ineradicability inerasableness inexpugnability insuperability inviolability invulnerability irresistibility predictability reliability secureness security solidity soundness stability staunchness steadfastness steadiness substantiality trustworthiness unassailability unattackableness unbeatableness unconquerableness unerringness validity