Fuckwitted

A mildly insulting/endearing term for someone who is slow on the uptake or just a bit dim.

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.

any living organism capable of rationalisation skills but rather chooses to put aside any common sense and reason and mindlessly fucks-up (blunders and turns to shit) everything this waste of life and bane on existance happens upon. such entities often times also possess tendencies to verbalize and promote their opinions,thoughts,and feelings as though they were rules of nature and uncompromising truths and universal fact

Someone who wastes time perusing pointless sites like Urban Dictionary rather than doing something productive. Applies particularly to those who submit definitions.

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.

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

a person with mental capabilities about 0.1% the power of a halfwit.