puerilely

/ˈpjʊərɪlli/
adverb
  1. In a childish or immature way.
    • Instead of discussing the problem, they puerilely made faces at each other.
    • She puerilely refused to share the crayons with her classmates.
    • He puerilely giggled at the teacher's serious announcement.
Antonyms
What does "puerilely" mean? | whatsthatwordmean | whatsthatwordmean