dunce

“But now in our age it is growne to be a common prouerbe in derision, to call such a person as is senselesse or without learning a Duns, which is as much as a foole.”

Francis Thynne, Holinshed’s Chronicles, 1587

The word dunce hasn’t always meant, well, dunce. Named for Scottish scholastic theologian John Duns Scotus, it first referred to a follower of Duns’s teachings, says the OED. Then it gained the derisive meaning of “a hair-splitting reasoner,” due to later philosophers who ridiculed his work, as well as “a dull pedant” and finally someone dull-witted.

Dunce cap might have first been used by Charles Dickens in his novel, The Old Curiosity Shop: “Displayed on hooks upon the wall in all their terrors, were the cane and ruler; and near them, on a small shelf of its own, the dunce’s cap, made of old newspapers and decorated with glaring wafers of the largest size.”

shenanigan (n.)

"nonsense; deceit, humbug," 1855, American English slang, of uncertain origin. Earliest records of it are in California (San Francisco and Sacramento). Suggestions include Spanish chanada, a shortened form of charranada "trick, deceit;" or, less likely, German Schenigelei, peddler's argot for "work, craft," or the related German slang verb schinäglen. Another guess centers on Irish sionnach "fox," and the form is perhaps conformed to an Irish surname.

also from 1855