Dictionary | 3 Results
#1 impregnable s. [inviolable, secure, strong, unassailable, unattackable] immune to attack; incapable of being tampered with; "an impregnable fortress"; "fortifications that made the frontier inviolable"; "a secure telephone connection". wn
#2 impregnable s. [conceptive] capable of conceiving. wn
#3 impregnable s. [inexpugnable] incapable of being overcome, challenged or refuted; "an impregnable argument"; "impregnable self-confidence". wn
#2 impregnable s. [conceptive] capable of conceiving. wn
#3 impregnable s. [inexpugnable] incapable of being overcome, challenged or refuted; "an impregnable argument"; "impregnable self-confidence". wn
