noun (n)

• a stupid person; these words are used to express a low opinion of someone's intelligence(noun.person)

  Synonym:
  blockhead, bonehead, dumbass, dunce, dunderhead, fuckhead, hammerhead, knucklehead, loggerhead, lunkhead, muttonhead, shithead
  

  source: wordnet30
• A dunce; a dolt; a stupid fellow.(noun)

  source: webster1913