Someone who thinks vulgar words are funny. Most children exhibit this behavior.
Child: I drew a butt! Ha ha ha! Me: That's not funny. That's immature.
by spel itt rite January 16, 2006
Get the Immature mug.
by revisiting old posts we were able to witness the immaturation of the internet from a place of cordial dissent to whiny bickering.
by kris takahashi August 26, 2009
Get the immaturation mug.
The process of becoming less responsible and capable over time.

Often a trait of a middle-aged person who has given up on taking care of themselves - either due to personal choice or unforeseen, unfortunate circumstances. Someone who is immaturing was more capable and responsible as a young adult than at their current older age. They often displace their burdens on people who care about them.
She's 53 and immaturing; I find it hard to believe she was ever able to pay her own bills.

After Jeff lost the business he started immaturing, now I hear he's trying to move in with his kids.

My mother-in-law has been steadily immaturing since her divorce 15 years ago.

At the rate bob is immaturing, he'll likely be fired in 6 months.
by GummieGirl August 31, 2017
Get the immaturing mug.
Kids acting 16 and 17 nowadays show immaturity by acting like 12 year olds..
by capule August 24, 2007
Get the Immaturity mug.
What people who post definitions to this site are best at.
Bob: Hey, did you see that definition on Urban Dictionary?
Frank: Yeah, it was immature at it's best. o_o
by TheOrlyGuyLol January 24, 2010
Get the Immature mug.
The adjective boring people use to describe fun people.
JK: "Nip slip!"
Maren: "You're so immature"
JK: "You're so boring"
Maren: "I know"
by jmfk November 18, 2014
Get the Immature mug.
Immature is a person, usually 8-15 year's old, (and mostly male) who think sexual and inappropriate things are funny.
This drives me totally crazy, when your the only kid of you age that is way more mature then everybody else areound you (like me)
They call everything they don't like gay, or retarded, and anybody smarter than them a nerd, because they are to incapable of realizing that they are stupid, and (not to be hypocritical) retarded...
-Immature person- You got high honor roll in school? Hahahha! Your such a gay nerd!

-Civilized person- Your immaturity is making yourself look bad...Not me
by TheJazzKidOfTheSchool666 June 23, 2009
Get the Immature mug.