unattackable
- adj.耐侵蚀的;不可攻破的；达不到的；不能完成的
unattackable
adj
1
- immune to attack;incapable of being tampered with
- an impregnable fortress
- fortifications that made the frontier inviolable
- a secure telephone connection
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Synonym: impregnable inviolable secure strong unassailable
数据来源：WordNet
