retardedest 

the most retarded, the highest level of retardness

That blexican is the most retardedest person i've ever met.

retardedest by disrespecting foo December 5, 2002

Retardedest 

Most retarded

You are the most retardedest people ever.

Retardedest by bigalwillis2007 October 10, 2019

retardedism 

Someone who is more than reatared and has a sickness of being stupid

I thick he he has retardedism

retardedism by Crazy@C May 20, 2017

retardedment 

(Also pronounced retaddedment)

The highest level of being retarded. One you must work hard to accomplish and once you get there you can't get any better so you have no choice but to retire at that point you have reached retardedment. Then you must go to a retardedment home for the rest of your retadded life

Hey look at mark over there he is so lucky he has reached retardedment. It is something I look forward to someday

retardedment by Jwrules May 7, 2016

retardest 

For people who are too lazy to say "most retarded".

"I've just heard the retardest song!"

retardest by xxshizzamxx January 3, 2009

Retardeditity 

A level of being retarded beyond the regular level of retardation.

Adams level of retardeditity never ceases to amaze me.

Retardeditity by Dragon Toes September 30, 2007

Retardeder 

The act of being MORE retarded than the person you are calling retarded.

He is so much more retardeder than his brother is.

Retardeder by Bacita Mae Jenkins March 22, 2022