a.
Methinks that simplicity in her countenance is rather childish than innocent. Addison. [ 1913 Webster ]
☞ Childish, as applied to persons who are grown up, is in a disparaging sense; as, a
adv. In the manner of a child; in a trifling way; in a weak or foolish manner. [ 1913 Webster ]
n. The state or quality of being childish; simplicity; harmlessness; weakness of intellect. [ 1913 Webster ]