Definition of immature adjective from the Oxford Advanced American Dictionary

      

    immature

     adjective
    adjective
    NAmE//ˌɪməˈtʃʊr//
     
    , NAmE//ˌɪməˈtʊr//
     
     
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  1. 1behaving in a way that is not sensible and is typical of people who are much younger immature behavior
  2. 2not fully developed or grown immature plants opposite mature
NAmE//ˌɪməˈtʃʊrət̮i//
 
, NAmE//ˌɪməˈtʊrət̮i//
 
noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: immature