A fool who lacks the brain capaticy to understand common sense or basic facts.
Martin : * displays his new piano*
Adam : Why did you buy a piano?

Martin : So I can play it, you simpleton.
by anonymous peep October 28, 2019
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the inglorious practice of remaining willfully ignorant.
Their simpletonism is what allows them to remain blissfully controlled.
by Hermathecles December 30, 2020
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Basic for a scientific term SMPLTNTS-20.

Simpletonitis is a mental condition that's just as easy to obtain in life as a regular STD. A condition in which causes a male to stare a woman down and not have any sexual encounter in any way.
I saw this man staring at this girl at the supermarket, and he just walked away. He may have simpletonitis.
by steammustachio March 30, 2020
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Noun - Someone who will trade their dignity for kitty. A man who puts the hoes before the bros.

Also when a male is overly submissive to a female they like knowing they are likely to gain little to nothing

A simp.
She looked at me funny when I asked to split the bill. I looked at her at said “Look I ain’t no Samuel Simpleton, I got other hoes tryna take ME out to dinner.”
by Jay Money from the Trap June 7, 2023
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The insanely rare "Simpleton-Brainer" is so rare it should be kept in a wildlife zoo with all possible restraints attached to avoid any unnecessary accident from evolving in it's chaotic environment. Anything below very high level smooth-boys should never be allowed in the near proximity or even visual reach from this monster, let alone manage and take care of it. Conveying this beast away from it's own misery is considered impossible by expert smooth scientists. So we're told to simply spectate and let it be.
Who peed on the dog again?, it must be the simpleton-brainer.
by Smoothbrainer69 October 22, 2020
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