immature

im·ma·ture

adj
\ˌim-ə-ˈt(y)u̇(ə)r also -ˈchu̇(ə)r\

Definition of IMMATURE

: lacking complete growth, differentiation, or development <immature blood cells> <emotionally immature>

—im·ma·ture·ly adverb

—im·ma·tu·ri·ty \-ˈt(y)u̇r-ət-ē also -ˈchu̇r-\ noun, plural im·ma·tu·ri·ties