unattackable

英

美

adj.  耐侵蚀的; 不可攻破的；达不到的；不能完成的

英英释义

adj

• immune to attack
  1. an impregnable fortress
  2. fortifications that made the frontier inviolable
  3. a secure telephone connection
  Synonym:impregnableinviolablesecurestrongunassailable