serious young man
definitions
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A young male who is earnest, solemn, and lacks frivolity or playfulness in his demeanor.fr: Jeune homme sérieux
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A stereotype of a young man who is overly intellectual, pretentious, or takes his philosophical or artistic pursuits with excessive gravity.fr: Jeune homme prétentieux
examples
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He was a serious young man who spent all his time studying.
C'était un jeune homme sérieux qui passait tout son temps à étudier.
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He played the part of the serious young man, discussing obscure poetry at every party.
Il jouait le rôle du jeune homme prétentieux, discutant de poésie obscure à chaque fête.