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 , unassailable ]
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 , unassailable ]