childishly russian

• по-де́тски

  childishly, like a child, in a childlike manner

• ребя́чившийся

  childish (who was childish), having acted childishly

• сюсю́кающий

  baby-talking, cooing, speaking childishly

Examples

• Она говори́ла по-детски.

  She talked childishly.