A person who is not only lacking in clue but is apparently unable or unwilling to acquire clue even when handed it on a plate in generous portions.

the thing that you don’t have when you’re phones percentage is over 20

A fuck-wit is a individual with absolute no wits or intelligence and tries to come off smart when really they are just a fuck wit

A very foolish person; idiot; imbecile; cockwomble; muppet; douche bag; somebody who makes outrageously idiotic statements while convinced that they are absolutely correct; somebody who doesn't understand basic English, or other appropriate language, or grasp fundamental concepts; somebody who is incapable of reason or logic; someone who acts in an egregious fashion.

Something resembling idiocy...only a wee bit nastier

A person so lacking in intelligence that they cannot grasp the simplest concepts.

Person of low intelligence, retard