| 单词 | impenetrable |
| 释义 | impenetrable —impenetrableness, n. —impenetrably, adv. /im pen"i treuh beuhl/, adj. 1. not penetrable; that cannot be penetrated, pierced, entered, etc. 2. inaccessible to ideas, influences, etc. 3. incapable of being understood; inscrutable; unfathomable: an impenetrable mystery. 4. Physics. possessing impenetrability. [1425-75; late ME impenetrabel < L impenetrabilis. See IM-2, PENETRABLE] Syn. 3. incomprehensible, mysterious, obscure, hidden. Ant. 3. clear, lucid. |
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