grown-up 2022.12.06 grown-upとは 意味・定義・例文 Adjective 形容詞 1. fully grown 成長した, 成熟した Grown-up babies, physically grownup but mentally immature people, are harmful to the society. Noun 名詞 1. an adult 大人 Part of being grown-up is being able to make sensible decisions.