inexpugnable

英[ˌɪnɪks'pʌgnəbl] 美[ˌɪnɪks'pʌgnəbəl]
  • adj. 不能攻占的;不能驳倒的
Adjective:
  1. incapable of being overcome, challenged or refuted;

    "an impregnable argument"
    "impregnable self-confidence"

【邻近词汇】