invulnerable Synonyms

protected from danger unbreakable airtight armoured armour-plated unsusceptible unyielding woundless unsurmountable unpenetrable undestroyable unconquerable tight strong sound solid shielded sheltered bulletproof unassailable case-hardened safeguarded well defended closed to unpierceable uninjectable unhazardous unstoppable riskless risk-free impregnably low-risk unhackable undefeatable unbeatable unattackable unsubduable untouchable shellproof securer indestructible impregnable impervious impermeable imperforate impenetrable impassable immune hardy guarded