Etymology
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dumbo 

"stupid person," by 1951, American English, from dumb (adj.). The Disney musical cartoon is from 1941; in it the elephant's name is a mocking nickname based on Jumbo.

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mome (n.)

"buffoon, fool, stupid person," 1550s, from Old French mome "a mask. Related" Momish. The adjective introduced by "Lewis Carroll" is an unrelated nonsense word.

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dopey (adj.)

"sluggish, stupefied," with or as with a narcotic drug; also "stupid" generally, 1896, from dope (n.) + -y (2). Related: Dopiness.

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puddinghead (n.)

"amiable stupid person," 1851, from pudding + head (n.). Pudding-face for "person having a fat, round, smooth face" is from 1748.

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cluck (n.)

1703, "sound made by a hen," from cluck (v.). Slang meaning "stupid person" (chickens and turkeys are famously foolish) is from 1927.

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boob tube (n.)
"television set," U.S. slang, by 1965, from boob "stupid person" + slang tube (n.) "television, television programming;" the original sets had vacuum tubes in them.
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meshuga (adj.)

"mad, crazy, stupid," 1892, from Hebrew meshugga, participle of shagag "to go astray, wander." The adjective has forms meshugener, meshugenah before a noun.

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bonehead (n.)

"stupid person," 1908, from bone (n.) + head (n.). Compare blockhead, meathead. Bone-headed "ignorant" is from 1903. Earlier it was used in reference to types of primitive spears or harpoons.

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hard-headed (adj.)
also hardheaded, 1580s, "stubborn," from hardhead "dull person" (1510s), from hard (adj.) + -headed. Meaning "practical, shrewd" is attested from 1779. Compare Dutch hardhoofdig "stupid."
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bird-brain (n.)
also birdbrain, 1936, slang, "stupid person," also perhaps suggestive of flightiness, from bird (n.1) + brain (n.). Bird-brained is attested from 1910 and bird-witted from c. 1600.
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