Roget's Thesaurus of English Words and Phrases by Peter Mark Roget

dizzard†, donkey, ass; ninny, ninnyhammer†; chowderhead†, chucklehead†; dolt, booby, Tom Noddy, looby†, hoddy-doddy†, noddy, nonny, noodle, nizy†, owl; goose, goosecap†; imbecile; gaby†; radoteur†, nincompoop, badaud†, zany; trifler, babbler; pretty fellow; natural, niais†. child, baby, infant, innocent, milksop, sop. oaf, lout, loon, lown†, dullard, doodle, calf, colt, buzzard, block, put, stick, stock, numps†, tony. bull head, dunderhead, addlehead†, blockhead, dullhead†, loggerhead, jolthead†, jolterhead†, beetlehead†, beetlebrain, grosshead†, muttonhead, noodlehead, giddyhead†; numbskull, thickskull†; lackbrain†, shallowbrain†; dimwit, halfwit, lackwit†; dunderpate†; lunkhead sawney [U.S.], gowk†; clod, clod-hopper; clod-poll, clot-poll, clot-pate; bull calf; gawk, Gothamite, lummox, rube [U.S.]; men of Boeotia, wise men of Gotham. un sot a triple etage [Fr.], sot; jobbernowl†, changeling, mooncalf, gobemouche†. dotard, driveler; old fogey, old woman, crock; crone, grandmother; cotquean†, henhussy†. incompetent (insanity) 503. greenhorn &c (dupe) 547; dunce &c (ignoramus) 493; lubber &c (bungler) 701; madman &c 504. one who will not set the Thames on fire; one who did not invent gunpowder, qui n'a pas invente' la poudre [Fr.]; no conjuror. Phr. fortuna favet fatuis [Lat.]; les fous font les festinas et les sages les mangent [Fr.]; nomina stultorum parietibus harrent [Lat.]; stultorum plena sunt omnia [Lat.] [Cicero].