Etymology
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jughead (n.)
"klutz, stupid person," 1926, from jug (n.) + head (n.).
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brainless (adj.)
late 15c., "witless, stupid," from brain (n.) + -less. Related: Brainlessly; brainlessness.
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muttonhead (n.)

"dull or stupid person," 1803, American English, from mutton + head (n.).

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dickhead (n.)

"stupid, contemptible person," by 1969, from dick in the "penis" sense + head (n.).

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duffer (n.)

"inept person; stupid, dull old man," 1842, especially "bad golfer" (by 1875), perhaps from Scottish duffar "dull or stupid person," from dowf "stupid," literally "deaf," from Old Norse daufr, with pejorative suffix -art. Or perhaps from 18c. thieves' slang duff (v.) "to dress or manipulate an old thing and make it look new," hence duffer "one who sells spurious goods at high prices" (1766).

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wack (n.)
"crazy person," 1938, back-formation from wacky. Adjective in slang sense of "worthless, stupid," is attested from late 1990s.
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dullard (n.)

"stupid person, dunce, simpleton," mid-15c. (but early 13c. as a surname), from dull (adj.) + -ard.

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numbskull (n.)

"dull-witted or stupid person," 1717, numskull, from num, old spelling of numb (adj.) + skull. Numskulled (adj.) is attested from 1706.

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ass-head (n.)
also asshead, "stupid person, dullard," late 15c., asse hede, from ass (n.1) + head (n.). Related: Ass-headed.
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gony (n.)
1580s, "simpleton, stupid person," of unknown origin. Applied by sailors to the albatross and similar big, clumsy birds (1839). Related: Gony-bird.
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