adj .
not obvious ; able to make fine distinctions ; ingenious ; crafty 뻔히 드러나지 않는 ; 좋은 성과를 낼 수 있는 ; 영리한 ; 교묘한

• The alien beings created a very shrewd replica of Mr. Jenson, but his wife did notice a few _____ differences, including the fact that the new Mr. Jenson had no pulse or internal organs.
• Joe's _____ mind enables him to see past problems that confuse the rest of us.
  조는 두뇌가 명석해서 우리가 당황하는 어려운 문제들도 해결할 수 있다.
• The burglar was very _____ ; he had come up with a plan that would enable him to steal all the money in the world without arousing the suspicious of the authorities.
  그 강도는 매우 명석했다 ; 그는 당국의 의심을 받지 않고도 세상의 모든 돈을 훔칠 수 있는 계획을 수립해 두었다.