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Boeotian (adj.)[Boeotian 词源字典]: 1590s, "ignorant, dull," from Boeotia, district around Thebes in ancient Greece (said to have been so called for its cattle pastures; Greek bous = "ox"), whose inhabitants were characterized as proverbially dull and countrified by their neighbors, the Athenians. The Boeotians presumably held reciprocal opinions, but their great writers, Plutarch and Pindar, though patriots, are full of praise for Athenian deeds and institutions.
Though his aim was to vindicate Boeotia, [Pindar] has probably done her a disservice, in that he has helped to immortalise the scurrilous proverb Βοιωτία ύς, which he wished to confute. ... If left to itself, the slander might have passed into oblivion long ago. [W. Rhys Roberts, "The Ancient Boeotians," 1895]
[Boeotian etymology, Boeotian origin, 英语词源]
knothead (n.): "stupid person," by 1899, American English, from knot (n.) + head (n.). Joe Knothead is the name of a character in an 1857 blackface satire publication. And a local history from Massachusetts published in 1879 describes an old-time character known as knot-head because "[d]uring the hottest days of summer ... he worked bare-headed in the sun ...."

Knothead also was used as a term in cattle and sheep raising, defined in 1922 as "a type of poorly bred, stunted northern cattle, about the size of yearlings, but with heavy horns indicating that they are older." It turns up, however, in an 1849 petition to the Ohio Legislature, recommending a certain person for a court position, in part because he is a knot-head, which the report of the petition notes is a term of praise for a judge because they are asked to untangle knotty legal questions, but which phrase, it adds, "is believed not to be in use among gentlemen in the north part of the State." [Appendix to the Journal of the Ohio House of Representatives, Session of 1848-9]