字谜

Definition: “Concerned with work or important matters rather than play or trivialities; "a _______ student of history"; "a _______ attempt to learn to ski"; "gave me a _______ look"; "a _______ young man"; "are you _______ or joking?"; "Don't be so _______!"”

第一个字母: S

请回答  

这个单词是什么?

"智商" 0
 
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