adjective🔗ShareNot penetrable."The fortress is impenetrable, so it cannot be taken."materialphysicsChat with AIVocabulary GamePractice Reading
adjective🔗ShareIncomprehensible; fathomless; inscrutable."The teacher's explanation of quantum physics was impenetrable; no one understood a single word. "languagemindphilosophyliteraturecommunicationqualityabstractChat with AIVocabulary GamePractice Reading
adjective🔗ShareOpaque; obscure; not translucent or transparent."When night falls, she cloaks the world in impenetrable darkness."appearancequalityChat with AIVocabulary GamePractice Reading
