Numskull \Num"skull`\, n. [Numb + skull.]

A dunce; a dolt; a stupid fellow. [Also spelled numbskull.]

[Colloq.]

[1913 Webster]

They have talked like numskulls. --Arbuthnot. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

40 Moby Thesaurus words for "numskull": addlebrain, addlehead, addlepate, beefhead, blockhead, blubberhead, blunderhead, bonehead, bufflehead, cabbagehead, chowderhead, chucklehead, clodhead, clodpate, clodpoll, dolthead, dullhead, dumbhead, dunderhead, dunderpate, fathead, jolterhead, jughead, knucklehead, lunkhead, meathead, muddlehead, mushhead, muttonhead, noodlehead, peabrain, pinbrain, pinhead, puddinghead, pumpkin head, puzzlehead, stupidhead, thickhead, thickskull, tottyhead

Source: Moby Thesaurus II by Grady Ward, 1.0
 

numskull

Source: WordNet (r) 2.0
 

Numskull \Num"skull`\, n. [Numb + skull.]

A dunce; a dolt; a stupid fellow. [Colloq.]

They have talked like numskulls. --Arbuthnot.

Source: Webster's Revised Unabridged Dictionary (1913)