child·ish /ˈʧaɪldɪʃ/
  (a.)天真的,孩子氣的
  Child·ish a.
  1. Of, pertaining to, befitting, or resembling, a child. “Childish innocence.”
  2. Puerile; trifling; weak.
     Methinks that simplicity in her countenance is rather childish than innocent.   --Addison.
  Note: ☞ Childish, as applied to persons who are grown up, is in a disparaging sense; as, a childish temper.
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  childish
       adj : indicating a lack of maturity; "childish tantrums";
             "infantile behavior" [syn: infantile]