childishly

/ˈtʃaɪldɪʃli/
adverb
  1. In a way that is silly, immature, or not appropriate for an adult.
    • He childishly pouted when he didn't get his way at the meeting.
    • They childishly giggled at the teacher's mispronunciation.
    • She childishly refused to share the remote control with her brother.
Antonyms
What does "childishly" mean? | whatsthatwordmean | whatsthatwordmean