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: incapable of being subdued or overthrown : impregnable
an inexpugnable position
: stable, fixed
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certain, determinate, final, firm, fixed, flat, frozen, hard, hard-and-fast, set, settled, stable
15th century, in the meaning defined at sense 1
Middle English in-expungnabull, from Latin inexpugnabilis, from in- + expugnare to take by storm, from ex- + pugnare to fight — more at pungent
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