boyish       
adjective uk/ˈbɔɪ.ɪʃ/ us/ˈbɔɪ.ɪʃ/
 男孩似的
used to describe behaviour or characteristics that are like those of a boy
  a boyish grin 男孩子气的一笑 
 She had her hair cut in a boyish style. 她剪了个男孩的发型。 
 Even as an old man he retained his boyish charm. 即使老了,他依然保留着那份童真。 
 She found his boyish good looks very attractive. 她觉得他那孩子气的漂亮外表很迷人。