immature

immature, unripe

i . m a . t y ʁ
im not; opposite of + mature mature
adjective Rare #32,326
immature
FR: Je le trouve un peu immature pour son âge.
EN: I find him a bit immature for his age.
unripe Used especially for fruit.
FR: Cette banane est encore immature.
EN: This banana is still unripe.

Tu es vraiment immature.

You are really immature.

— Juno (2007)

Mon frère est un garçon immature.

My brother is an immature boy.

Je pense que tu as été très immature.

I think you were very immature.

Vous êtes immature.

You are immature.

Si tu avais vécu autant que John, tu serais encore immature.

If you had lived as long as John, you would still be immature.

— The Man from Earth (2007)

Tu es immature.

You are immature.

C'est si immature.

That's so immature.

Quel immature!

What an immature person!

— Enquête sur un citoyen au-dessus de tout soupçon (1970)

Elle est jeune et immature.

She is young and immature.