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

      

    immature

     adjective
    adjective
    BrE BrE//ˌɪməˈtjʊə(r)//
     
    ; NAmE NAmE//ˌɪməˈtʃʊr//
     
    , NAmE//ˌɪməˈtʊr//
     
    Youth
     
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  1. 1behaving in a way that is not sensible and is typical of people who are much younger immature behaviour Wordfinderadolescent, immature, mixed up, naive, puberty, rebellious, sulky, tearaway, teenager, young See related entries: Youth
  2. 2not fully developed or grown immature plants
  3. opposite mature
    Word Origin mid 16th cent. (in the sense ‘premature’, referring to death): from Latin immaturus ‘untimely, unripe’, from in- ‘not’ + maturus ‘ripe’.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. The immature birds have shorter tails and brown, speckled plumage.
See the Oxford Advanced American Dictionary entry: immature