相关单词近义词 unassailable 攻不破的, invincible 不可征服的, unconquerable 不可征服的, strong 强烈的, resistant 抵抗的, secure 安全的, impenetrable 不能穿过的, invulnerable 固若金汤的, indestructible 不易毁坏的, inviolable 不可侵犯的, conceptive 概念的, inexpugnable 不能攻占的, unattackable 耐侵蚀的临近词impregnate, imprecise, impregnable virtue, impregnable defenses相似词impracticable, impractical, imprecation, imprecise, impregnate, impresario, impress, impress sth on/upon sb, 返回 impregnable