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Definition of immature adjective from the Oxford Advanced Learner's Dictionary

immature

adjective
 
/ˌɪməˈtjʊə(r)/
 
/ˌɪməˈtʃʊr/,
 
/ˌɪməˈtʊr/
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  1. behaving in a way that is not sensible and is typical of people who are much younger
    • immature behaviour
    Extra Examples
    • Although she was older than her husband, she was emotionally quite immature.
    • He displays very immature behaviour for a boy of 16, running about the classroom and yelling.
    • Oh, don't be so immature.
    Topics Life stagesb2
    Oxford Collocations Dictionaryverbs
    • be
    • seem
    • sound
    adverb
    • extremely
    • fairly
    • very
    See full entry
  2. not fully developed or grown
    • immature plants
    • The immature birds have shorter tails and brown, speckled plumage.
    opposite mature
    Oxford Collocations Dictionaryverbs
    • be
    • seem
    • sound
    adverb
    • extremely
    • fairly
    • very
    See full entry
  3. Word Originmid 16th cent. (in the sense ‘premature’, referring to death): from Latin immaturus ‘untimely, unripe’, from in- ‘not’ + maturus ‘ripe’.
See immature in the Oxford Advanced American DictionarySee immature in the Oxford Learner's Dictionary of Academic English
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