Entry Word: immature

Function: adjective

Meaning: 1 being in the early stage of life, growth, or development <immature frogs are called “tadpoles”> — see young
2 having or showing the annoying qualities (as silliness) associated with children <an immature teenager who still threw tantrums> — see childish
3 lacking in adult experience or maturity <many high school students are still too immature to foresee the consequences of their actions> — see callow