| 单词 | impregnable |
| 释义 | Word Frequency impregnable 1(ɪmˈprɛɡnəbəl) adjective 1. unable to be broken into or taken by force an impregnable castle 2. unable to be shaken or overcome impregnable self-confidence 3. incapable of being refuted an impregnable argument Derived forms impregnability (imˌpregnaˈbility) or impregnableness (imˈpregnableness) noun impregnably (imˈpregnably) adverb Word origin C15 imprenable, from Old French, from im- (not) + prenable able to be taken, from prendre to takeWord Frequency impregnable 2(ɪmˈprɛɡnəbəl) or impregnatable (ˌɪmprɛɡˈneɪtəbəl) adjective able to be impregnated; fertile |
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