inexpugnable From WikiWord, the free dictionary English Contents DefinitionsRelated wordsReferences DefinitionsadjectiveImpossible to eliminate or destroy; impregnable. Related wordsSynonymsunconquerableimpregnableimprenableunassailableunimpregnableunexpugnableunimpugnableinviolableinoppugnableunpregnablebreachlessimpierceableuninvadableinvincibleinconquerableinexterminable References Wiktionary — inexpugnable Wikipedia — inexpugnable