infantile
/ˈɪnfənˌtaɪl/
adjective
- Relating to or typical of a very young child or baby.
- The museum has a section on infantile development and early learning.
- The pediatrician specializes in infantile diseases.
- Her infantile laughter filled the room with joy.
- Childish, immature, or silly in a way that is not appropriate for an adult.
- His infantile behavior during the meeting embarrassed everyone.
- She found his constant whining to be utterly infantile.
- Stop making those infantile jokes; we need to focus on the problem.