immature
adjective/imɐˈtuɾʊ/medium
i·ma·tu·ro
Definition
That has not reached full development; lacking physical, emotional, or intellectual maturity.
The teenager's immature behavior worried the parents.
The fruit was still immature and could not be eaten.
Common collocations
immature behaviorimmature fruitimmature thinking
Etymology
Do latim 'immaturus'.