അർത്ഥം : Immune to attack. Incapable of being tampered with.
							ഉദാഹരണം : 
							An impregnable fortress.
							Fortifications that made the frontier inviolable.
							A secure telephone connection.
							
പര്യായപദങ്ങൾ : inviolable, secure, strong, unassailable, unattackable
അർത്ഥം : Capable of conceiving.
പര്യായപദങ്ങൾ : conceptive
അർത്ഥം : Incapable of being overcome, challenged or refuted.
							ഉദാഹരണം : 
							An impregnable argument.
							Impregnable self-confidence.
							
പര്യായപദങ്ങൾ : inexpugnable