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      impregnable
      
	
      英 [?m'pregn?b(?)l]
美[?m'pr?ɡn?bl]

      


	    
      
	
        
    
      • adj. 無(wú)法攻取的；不受影響的；要塞堅(jiān)固的；可以受孕的
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      英英釋意
      
	
      
	
      1. able to withstand attack;
      "an impregnable fortress"
      "fortifications that made the frontier inviolable"
      

      2. impossible to take by storm