资料来源 : pyDict

天真地;幼稚地

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Childishly \Child"ish*ly\, adv.
   In the manner of a child; in a trifling way; in a weak or
   foolish manner.

资料来源 : WordNet®

childishly
     adv : in a child-like manner; "he acted very childishly"