Impregnable - Definition
impregnable
adj 1: 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, unattackable]
2: capable of conceiving [syn: conceptive, impregnable]
3: incapable of being overcome, challenged or refuted; "an
impregnable argument"; "impregnable self-confidence" [syn:
impregnable, inexpugnable]