dunderhead Meaning, Definition & Usage

  1. noun a stupid person; these words are used to express a low opinion of someone's intelligence
    bonehead; shithead; hammerhead; dunce; knucklehead; blockhead; fuckhead; dumbass; loggerhead; lunkhead; numskull; muttonhead.

WordNet

Dun"der*head` noun
Etymology
Prov. Eng. also dunderpoll, from dunder, same as thunder.
Definitions
  1. A dunce; a numskull; a blockhead. Beau. & Fl.

Webster 1913