1. 不能攻占的:inexpressive 缺乏表情的 | inexpugnable 不能攻占的 | inexpungibility 不能除去
2. 不能攻占的/不能驳倒的:inexpressiveness /无表情/ | inexpugnable /不能攻占的/不能驳倒的/ | inextensibility /不可伸长性/非延伸性/
adj
1. incapable of being overcome, challenged or refuted
e.g. an impregnable argument
impregnable self-confidence
Synonym: impregnable
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