1. the quality or state of being impossible to capture, break through, or overcome; the condition of being impregnable
Usage: often used in military or defensive contexts; can be used figuratively to describe ideas, arguments, or positions

Examples

• The fortress's impregnability made it a strategic stronghold for centuries.
• The team's defense demonstrated an almost legendary impregnability during the championship season.
• Engineers designed the dam with impregnability in mind to withstand extreme flooding.
• The impregnability of the castle walls protected the kingdom from invasion.
• Her logical argument had an impregnability that no critic could challenge.
• The mountain fortress's impregnability was legendary among ancient military strategists.