dunderhead

It actually appears that Eric Trump, despite his dunderhead reputation, was far more involved in running the place.

The claim has been surprisingly popular even in more left-leaning media, likely because their audiences often prefer to see Trump framed as a dunderhead rather than as someone with the basic literacy skills to understand the value in, say, a document about U.S. defense capabilities.

Adolf Hitler was described by a prominent magazine editor in 1930 as a "big mouth," a "half-insane rascal," a "pathetic dunderhead" and a "nowhere fool."

Margot Asquith, wife of his first prime minister, described him as a “dunderhead.”

Paula Murrihy’s Ruggiero is the easily swayed dunderhead who is entrapped by Alcina.