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immature,underdeveloped cerebral cortex,unfit for real world survival
Jimmy scored ninety on the I.Q.test. What a brainlet!
brainlet by TinFoilHatGuy May 11, 2017
Someone associated with having a low iq and a below average common sense.
Tilly you brainlet!
Brainlet by Kaprie May 30, 2018
Individuals that search their names on Urban Dictionary and share the definition with others in order to feel good about them seleves. These people generally have IQs equivalent to that of small fish and think that Lelepons is funny.
"Hey, check out that brainlet over there."

Los Braingeles 

The city of the future! (from Aqua Teen Hunger Force episode 3)
They use starfish for money!
Los Braingeles by Danin April 22, 2004
A person that acts without any care of what'll be the consequences of what he's doing. Also a stupid, superficial, dull person.
1. Oh, damn! You act like you're brainless! Don't you think about what will happen if you do that?

2. That boy's brainless. I suggest you to not go out with him.
Brainless by KD Squib September 10, 2005
somebody who has a very small brain and can't make simple decisions
"Liam doesn't use his shield, what a brainlet[
brainlet by PoobMeister August 16, 2019