Etymology
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fuckwit (n.)
"fool idiot," slang, c. 1970, originally British or Australian English, from fuck + wit (n.).
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patch (n.2)

"fool, clown," 1540s, perhaps from Italian pazzo "fool," a word of unknown origin. Possibly from Old High German barzjan "to rave" [Klein]. But Buck says pazzo is originally euphemistic, and from Latin patiens "suffering," in medical use, "the patient." The form perhaps was influenced by folk etymology derivation from patch (n.1), on notion of a fool's patched garb.

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elude (v.)
1530s, "delude, make a fool of," from Latin eludere "finish play, win at play; escape from or parry (a blow), make a fool of, mock, frustrate; win from at play," from assimilated form of ex "out, away" (see ex-) + ludere "to play" (see ludicrous). Sense of "evade" is first recorded 1610s in a figurative sense, 1630s in a literal one. Related: Eluded; eludes; eluding.
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muggins (n.)

"fool, simpleton," 1855, of unknown origin, apparently from the surname and perhaps influenced by slang mug "dupe, fool" (1851; see mug (n.2)). It also was the name of simple card game (1855) and the word each player tried to call out before the other in the game when two cards matched. The name turns up frequently in humor magazines, "comic almanacks," etc. in 1840s and 1850s.

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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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jobbard (n.)

"fool, stupid man," mid-15c., jobard, probably from French jobard (but this is not attested before 16c.), from jobe "silly." Earlier jobet (c. 1300).

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berk (n.)

"fool," 1936, abbreviation of Berkshire Hunt (or Berkeley Hunt), rhyming slang for cunt but typically applied only to contemptible persons, not to the body part.

This is not an objective, anatomical term, neither does it imply coitus. It connects with that extension of meaning of the unprintable, a fool, or a person whom one does not like. ["Dictionary of Rhyming Slang," 1960]
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gowk (n.)
"cuckoo," early 14c., from Old Norse gaukr, from Proto-Germanic *gaukoz (source also of Old English geac "cuckoo," Old High German gouh). Meaning "fool" attested from c. 1600.
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flapdoodle (n.)
1833, originally "the stuff they feed fools on" [Marryat]; probably an arbitrary formation from elements meant to sound ridiculous, perhaps with allusions to flap "a stroke, blow" and doodle "fool, simpleton."
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wacky (adj.)
"crazy, eccentric," 1935, variant of whacky (n.) "fool," late 1800s British slang, probably ultimately from whack "a blow, stroke," from the notion of being whacked on the head one too many times.
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