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.

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

Something resembling idiocy...only a wee bit nastier

Person of low intelligence, retard

Idiot (generally male) that makes suggestions or comments without first considering the feeling of others.

British slang for a dumbass jackoff.