1. impregnable - adjective
· immune to attack; incapable of being tampered with; "an impregnable fortress"; "fortifications that made the frontier inviolable"; "a secure telephone connection"
Synonym(s): inviolable, secure, strong, unassailable, unattackable
2. impregnable - adjective
· capable of conceiving
Synonym(s): conceptive
3. impregnable - adjective
· incapable of being overcome, challenged or refuted; "an impregnable argument"; "impregnable self-confidence"
Synonym(s): inexpugnable
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