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A person who is incapable of performing the simplest of task correctly. Usual symptoms include poor hand-eye coordination, zero common sense and the general illusion that they are special (caused by parents referring to them as such and the numpty not fully grasping the meaning implied).

Common causes are being dropped as a baby or repeated heavy blows to head in later life.
person1: Jeff could you pass me the pen?
Jeff: ooops! (while dropping the pen)
Person1: Jeff you're such a numpty!
numpty by punchlinestapler September 22, 2010
As a verb: To screw up completely and/or hilariously.
As a noun: A complete failure, referring to a person.
"Alright, I need to take care of this paper before Darius numpts it (up)."
or
"I already know the button inputs, you numpt."
Numpt by Darius Oak September 30, 2016

Numpty Muffin

A term used to hate on French people and walk all over them we all hate you BaldBoyHalo
Numpty Muffin by Skepeen September 12, 2019
Woody was a numpty for misplacing his iPhone at the strip club.
Numpty by 1367 November 25, 2012
A person who never has or never will have a f*ing clue what he is doing
numpty by Nested One October 14, 2003

numptyesque 

Adjective. Something that is like a numpty
Bob was a very numptyesque fellow.
numptyesque by Anonimous moose September 23, 2008