ADJ-GRADED (尤指在困难形势下)头脑清楚的，清醒的，明事理的 If you describe someone as clear-headed, you mean that they are sensible and think clearly, especially in difficult situations. (尤指在困难形势下)头脑清楚的，清醒的，明事理的 [approval]
...his clear-headed grasp of the laws of economics.