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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

brainlit 

When someone does something extremely stupid in a game or irl, you call them a brainlit. Can be used as a less vulgar substitution for dumbass.
Person 1: Oops, I didn't mean to!
Person 2: You could have easily avoided that you absolute brainlit!
brainlit by redundant March 24, 2019
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."

Brainlit 

A monumentally stupid person, retard, mongoloid, dingus, dumb shit, dip shit, shit for brains, ass hat, fuck head, knuckle fart, mouth breather, etc.
Wow, that brainlit had the nerve to question you? Fuck that guy!
Brainlit by Banana Hammie November 15, 2019
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