Childish, puerile, sophomoric, infantile , juvenile. All mean immature to some degree.
"im" is a prefix in the word "immature" which means "not" or "lacking." So, "im" in "immature" indicates that something is not fully developed or grown.
young, immature
immature
A 'kid' , when one means a 'child'. A 'kid' is an immature goat.
People were talking about how immature the boy was.
"Immature" is an adjective, the opposite of "mature."
ish.---Actually, -ish is a suffix, not a prefix. A prefix is the front part of a word. For instance, take the word immature. That means childish, and the prefix is im- which means not. So an immature person is not mature, but childish.If you want another suffix for child that makes the meaning the same, you can add -like. So a person can be childlike.
sophmoric means immature so sophmoric humor is immature humor
immature
You are immature.
Immature can mean childish or stubborn. The immature boy did not want to tie his shoes, and then fell.
The prefix "im-" in immature indicates a negative or opposite meaning, so immature means not fully developed or grown.