Longman Dictionary of Contemporary English homepage

immature

adjective
     
im‧ma‧ture
1 someone who is immature behaves or thinks in a way that is typical of someone much younger - used to show disapproval [≠ mature; = childish]:
He forgave his son's immature behaviour.
2 not fully formed or developed:
measures to protect immature whales
immaturity noun [uncountable]

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