ಅರ್ಥ : Immune to attack. Incapable of being tampered with.
ಉದಾಹರಣೆ :
An impregnable fortress.
Fortifications that made the frontier inviolable.
A secure telephone connection.
ಸಮಾನಾರ್ಥಕ : impregnable, inviolable, secure, strong, unassailable