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dunderhead (n.)

"dunce, numbskull," 1620s, from head (n.); the first element is obscure; perhaps from Middle Dutch doner, donder "to thunder" (compare blunderbuss). Dunder also was a native dialectal variant of thunder. In the same sense were dunder-whelp (1620s); dunderpate (1754); dunderpoll (1801).

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