Sentence:  "[Y]ou're a jobbernowl and a doodle, a maundering mooncalf and a blockheaded numps, a <WSD>gaby</WSD> and a loon; you're a "Hatter"!" I shrieked the last epithet. 
Meaning of the word marked with <WSD> tags:  A stupid, foolish person; a simpleton; a dunce.