Definition of Dunderhead

Babylon English Dictionary
stupid person, dunce
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Dunderhead Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(n.)
A dunce; a numskull; a blockhead.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
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dunderhead
\dun"der*head`\ (?), n. [prov. eng. also dunderpoll, from dunder, same as thunder.] a dunce; a numskull; a blockhead. & fl.

WordNet 2.0

Noun
1. these words are used to express a low opinion of someone's intelligence
(synonym) dunce, numskull, blockhead, bonehead, lunkhead, hammerhead, knucklehead, loggerhead, muttonhead, shithead, fuckhead
(hypernym) simpleton, simple
Dunderhead Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
An idiot, dolt, or dullard is a mentally deficient person, or someone who acts in a self-defeating or significantly counterproductive way. Archaically the word mome has also been used. The similar terms moron, imbecile, and cretin have all gained specialized meanings in modern times. An idiot is said to be idiotic, and to suffer from idiocy. A dunce is an idiot who is specifically incapable of learning. An idiot differs from a fool (who is unwise) and an ignoramus (who is uneducated/an ignorant), neither of which refers to someone with low intelligence.

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