Retardnosis 

A mental disease which causes severe stupidity at its finest.

Doctor: You have retardnosis
Me: uahhahsudushauah

Retardnosis by charlottemorgan January 20, 2019

retardness 

state or level of retardation

larry's retardness is rediculous this is the third time this week he locked himself in the bathroom.

retardness by garrett10121 August 28, 2008

Retardosity 

The quality of being a retard. Of one who has special needs; to require a helmet.

The level of retardosity on this message board is astounding.

Retardosity by Dan Avenell November 28, 2003

Retardness 

Fortnite

Person: Tell me what is the most retarded thing in the world
Me: That shitty game Fortnite is just absolute retardness in a nutshell

Retardness by FUCKUDEDITORSBIGTIME March 27, 2021

Retardness 

Refer to the art of being a retard

Look at Nicky go, his retardness if flawless.

Retardness by unrealbeam May 20, 2021