immature

/ˌɪməˈtjʊə(r) ˌइमˈट्‌युअ(र्‌)/ adj.

1 not fully grown or developed अविकसित; अपरिपक्‍व

an immature body

2 (used about a person) behaving in a way that is not sensible and is typical of people who are much younger (व्‍यक्ति) नादानी भरा और अपने से छोटे लोगों जैसा आचरण करने वाला, बचकानेपन से पेश आने वाला

I think he’s too immature to take his work seriously.

✪ विलोम mature