numbskull 

a foolish or stupid person; an idiot.

someone with a numb skull, i.e. someone who feels no pain when you whack them repeatedly upside the head.

What a numbskull! Come 'ere, numbskull, i'm gonna smack you again.

numbskull by wan_sok July 31, 2004

numbskullery 

Stupid acts. Used by Mr. Burns in The Simpsons

Mr. Burns: "I can't take much more of your blundering numbskullery"

numbskullery by Joe R. April 4, 2006

Numskullduggery 

An amalgamation of "Numbskull" and "Skullduggery". Can be employed to describe an amusing, risqué, or banter-incucing act, as perpetrated by a numbskull.
Although not in common usage, would work best used by an Englishman, ideally a gentleman from the East End of London.

"Wot on the Sweet Lord's green erf joo fink you woz ap to larst night 'Arry?"

"Wojoomean boss? We wos jus 'avin a larf. Not mar fault the boys in blue turned ap!"

"Well yore faakin' numskullduggery nearly got us locked ap you tit!"

Numskullduggery by Kilpin May 29, 2007

num skull 

num·skull also numb·skull
NOUN.
A stupid person
num (variant of numb) + skull.

How Could You get Hit BY A parked car,you Num Skull!

num skull by CHRIS MCGAHA May 30, 2006

Numbskull 

A playful insult for someone who is being slightly dumb.

Person 1: WHY DID YOU TOUCH THAT, IT SAYS DO NOT TOUCH!
Person 2: Whoops.
Person 1: Ugh, you numbskull xD

Numbskull by ShadowyLondoner May 17, 2016

numbskull 

a dimp, simp, simpy, dimpleton, simpleton, dopey, dopleton

Danm you so numbskull.

numbskull by dimpydoo22 April 18, 2011

NumbSkull 

NumbSkull is a term used to insult someone. The person recieving the insult is usually dumb and doesnt have much clue on what there doing.

Tom "Oi Andy ur such a NumbSkull for fucking sheree"
Andy "why?!"
Tom " she's got gohnerea"
Shap " you NumbSkull"

NumbSkull by Big Hesk April 8, 2019