immature
🇺🇸
/ˌɪməˈtʃʊr/
🇬🇧
/ˌɪməˈtjʊə(r)/
adjective
R
acting in a silly way like a child
His immature jokes made the meeting less serious.
R
not fully grown or developed
The immature fruit is still green and hard.
translation
acting in a silly way like a child; not fully grown or developed