Definition: being a dunderhead
What is a dunder, and why do we use thisword to insult people in a somewhat mild fashion? Alas, this is but one moreunknowable in a long line of things that etymology has not yet figured out. Itmay come from the Dutch word for “thunder” (donder), but no one is sure aboutthat. What we are sure about is that there are a great number of words for“stupid” or “stupid person” ending in -headed or head. A partial list includesthe following: airhead, beefheaded, beetleheaded, blockhead, bonehead,bullhead, bubblehead, buffle-headed, butthead, chucklehead, deadhead, fathead,flathead, hammerhead, heavy-headed, idleheaded, ironhead, jolt-headed, jughead,knucklehead, loggerheaded, lunkhead, meathead, muddlehead, pinhead, pinheaded,ramhead, saphead, sheepheaded, sheepshead, thickhead, and wooden-headed.
Thus I pass away the time, and this lullsme on to drudge on the end of the Chapter with this Dunderheaded Master ofmine, who to my knowledge is more a Madman than a Knight.
— Miguel de Cervantes, Don Quixote (anon. trans.), 1703