Etymology
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muzzy (adj.)

"confused, dazed, stupid, tipsy," 1720s, perhaps from mossy, or from dialectal mosey (adj.) "moldy, hazy; stupefied with drink, dull, stupid."

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meathead (n.)
"stupid person," 1945, from meat + head (n.).
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dupe (n.)

"one easily deceived or led astray by false representations," 1680s, from French dupe "deceived person," from duppe (early 15c.), thieves' jargon, perhaps from phrase de huppe "of the hoopoe," an extravagantly crested and reputedly stupid bird. For names of supposedly stupid birds applied to stupid persons, compare booby, goose (n.), gull (n.2) .

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lame-brain (n.)
"stupid person," 1921, from lame (adj.) + brain (n.).
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dolt (n.)

"dull, stupid fellow," 1540s, perhaps a variant of dold "dull, foolish" (mid-15c.), influenced by dulte, dolte, past-participle forms of Middle English dullen "to dull; make or become dazed or stupid" (see dull (v.)). Related: Doltish "foolish, stupid" (1540s); doltishly; doltishness.

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asinine (adj.)
c. 1600, "obstinate, stupid, offensively silly," from Latin asininus "stupid," literally "like an ass," from asinus "ass," also "dolt, blockhead" (see ass (n.1)). The literal sense in English is recorded from 1620s. Related: Asininity.
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oafish (adj.)

"like an oaf, stupid, dull," 1610s, from oaf + -ish. Related: Oafishly; oafishness.

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bullet-headed (adj.)
1680s, "stupid;" 1722, "having a bullet-shaped head," from bullet (n.) + -headed.
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muddle-headed (adj.)

"confused; stupid," 1759; see muddle (v) + head (n.).

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besotted (adj.)
"stupid, infatuated," 1570s, past-participle adjective from besot. Related: Besottedness.
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