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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.
by KD Squib August 28, 2005
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May 12 Word of the Day
When someone goes to the gym and spends 90% of the time on their phones scrolling through social media
Looks like its thumb day again for Jimmy with his usual routing... 3 sets of 5 snapchat selfies and 10 sets of scrolling through facebook until exhaustion
by Gary br April 02, 2017
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2
People with no brain, idiot, dumb...
Or, people dressed like homeless listening bad reggea, anytime sleeping, with antique shoes (nastase for exemple), and who have a strap in his hair, like youg school girl...
and who is a looser at 'trivial pursuit'.
toumeuh is a 'brainless'.
by pozi October 19, 2006
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3
A backflip with a 180 degree turn on a ramp, a rollerblading trick.
That grommet just did a brainless!
by Kody_Bank's_Girl November 24, 2005
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4
An old english term for academics who herald from Marmesbury. (A town in England) a "jonny runny poo" is a rare breed. Usually found in any university library, flicking through back issues of country life, this creature adores all things Wildean, debauched and longs to marry a ho ming from Pobo.
Come here Jonny Runny Poo, stop being so brainless.

by FOSHIZZLEMANIZZLE October 30, 2006
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5
Joao is brainless because he’s doesn’t have a brain
by eimaikoukla September 22, 2018
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6
the people who are in the flat earth society
"im apart of the flat earth society"
"no wonder why your (brainless)"
by human clone of a donkey March 17, 2019
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