puerile       
adjective  disapproving uk/ˈpjʊə.raɪl/ us/ˈpjuː.ɚ.ɪl/
 幼稚的,傻气的
behaving in a silly way, not like an adult
  I find his sense of humour rather puerile. 我发现他的幽默感相当傻气。 
 Synonyms: childish immature juvenile 
 
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