immaturity

/ˌɪməˈtʃʊrəti/
noun
  1. The state of not being fully grown or developed.
    • Brain immaturity in teenagers affects their decision-making.
    • The doctor explained that the baby's lung immaturity was normal for her age.
    • The immaturity of the seedlings made them vulnerable to frost.
  2. Behavior that is childish, foolish, or not responsible.
    • The manager was tired of the team's immaturity and lack of focus.
    • His immaturity showed when he refused to apologize.
    • She regretted her immaturity during the argument.
Antonyms
What does "immaturity" mean? | whatsthatwordmean | whatsthatwordmean