immature
/ˌɪməˈtʃʊr/
adjective
- Not fully grown or developed; young.
- The doctor said the baby's lungs were still immature at birth.
- Immature plants need extra water and protection from the sun.
- The immature birds still have their baby feathers.
- Behaving in a way that is not as sensible or responsible as expected for someone of that age.
- Stop being so immature and take responsibility for your actions.
- It was immature of her to storm out of the meeting just because she disagreed.
- His immature jokes annoyed the older students.
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