1. the quality or state of being childish, immature, or infantile in behavior or manner
Usage: uncountable; often used critically or disapprovingly

Examples

• His babyishness was evident in the way he threw a tantrum when he didn't get his way.
• The coach criticized the team's babyishness on the field, saying they needed to act like professionals.
• She outgrew the babyishness of her teenage years and became more responsible.
• His constant whining and complaining showed a level of babyishness that annoyed his coworkers.
• The babyishness of their argument—name-calling and pouting—made it hard to take seriously.
• Parents often struggle with their children's babyishness during the transition to adolescence.