- 1behaving in a way that is not sensible and is typical of people who are much younger immature behaviour Wordfinderyoungadolescent, immature, mixed up, naive, puberty, rebellious, sulky, tearaway, teenager, young Oxford Collocations Dictionary verbsbe, seem, sound, … adverbextremely, fairly, very, … See full entry See related entries: Youth
- 2not fully developed or grown immature plants Oxford Collocations Dictionary verbsbe, seem, sound, … adverbextremely, fairly, very, … See full entry opposite mature Word Originmid 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.
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BrE BrE//ˌɪməˈtjʊə(r)//; NAmE NAmE//ˌɪməˈtʃʊr//, NAmE//ˌɪməˈtʊr//
YouthCheck pronunciation: immature