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immature adjective

  /ɪməˈtjʊə(ɹ)/ , /ɪməˈt͡ʃə(ɹ)/ , /ɪməˈt͡ʃʊə(ɹ)/
  • Childish in behavior; juvenile. [from 20th c.]
 大人げない, 未熟
  • Not fully formed or developed; not grown. [from 17th c.]
 未熟

immaturity

未熟
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