A young person, usualy a 8-14 year old male that knows 100+ words that mean penis and lives his life just to have them all published in an on line dictionary of slang.
Oh my! You knew that another word for penis is pennyprick! How immature of you to try publish it.
by Tenarr June 22, 2005
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an unwillingness to recognize, like those around you, that your head is up your rear end, and you like it there.
by deviant May 8, 2003
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Just because you're in high school doesn't mean people cannot be immature. Maturity is nothing but a mere joke.
by StraightFMan April 10, 2006
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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
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someone who cannot control their emotional behavior
Some people can act immature when they feel they are attacked.
by Gerard Irick March 24, 2010
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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
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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
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