Etymology
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sordid (adj.)

early 15c., "festering," from Latin sordidus "dirty, filthy, foul, vile, mean, base," from sordere "be dirty, be shabby," related to sordes "dirt, filth," from PIE *swrd-e-, from root *swordo- "black, dirty" (source also of Old English sweart "black"). Sense of "foul, low, mean" first recorded 1610s. Related: Sordidly; sordidness.

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sty (n.1)

"pen for pigs," Old English sti, stig "hall, pen" (as in sti-fearh "sty-pig"), from Proto-Germanic *stijan (source also of Old Norse stia "sty, kennel," Danish sti, Swedish stia "pen for swine, sheep, goats, etc.," Old High German stiga "pen for small cattle"). Meaning "filthy hovel" is from 1590s.

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crummy (adj.)

1560s, "easily crumbled;" 1570s, "like bread," from crumb + -y (2). Slang meaning "shoddy, filthy, inferior, poorly made" was in use by 1859, probably from the first sense, but influenced by crumb in its slang sense of "louse." The "like bread" sense probably accounts for 18c. (and later in dialects) use, of a woman, "attractively plump, full-figured, buxom."  Related: Crummily; crumminess.

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beastly (adj.)

c. 1200, "brutish, sensual, debased;" late 14c., "in the manner of a beast," from beast + -ly (1). It weakened in British upper crust use to "awfully, exceedingly" by mid-19c. Beastly drunk is from 1794.

Beastly expresses that which is altogether unworthy of a man, especially that which is filthy and disgusting in conduct or manner of life. Bestial is applied chiefly to that which is carnal, sensual, lascivious: as, bestial vices or appetites. [Century Dictionary]
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bawdy (adj.)

late 14c., baudi, "soiled, dirty, filthy," from bawd + -y (2). Perhaps influenced by Middle English bauded, bowdet "soiled, dirty," from Welsh bawaidd "dirty," from baw "dirt, filth." The meaning "lewd, obscene, unchaste" is from 1510s, from notion of "pertaining to or befitting a bawd;" usually of language (originally to talk bawdy).

Bawdy Basket, the twenty-third rank of canters, who carry pins, tape, ballads and obscene books to sell. [Grose, "Dictionary of the Vulgar Tongue," 1785]

Related: Bawdily; bawdiness. Bawdy-house "house of prostitution" is from 1550s.

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impure (adj.)

mid-15c., of wine, "muddy, not clear," from Old French impur (13c.), from Latin impurus "not pure, unclean, filthy, foul," from assimilated form of in- "not, opposite of" (see in- (1)) + purus "pure" (see pure).

In English, the subsequent order of sense appearance seems to be "earthly, mundane, not spiritual" (c. 1500); "obscene, lewd, unchaste, immoral" (1530s); "mixed with offensive matter, tainted" (1590s); "mixed or combined with other things" (without reference to foulness), 1620s. As a noun from 1784. Related: Impurely.

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nasty (adj.)

late 14c., nasti, "foul, filthy, dirty, unclean," literally or figuratively, a word of uncertain origin. Middle English Compendium says from Old Norse (compare Swedish dialectal and Danish naskug, nasket "dirty, nasty") with Middle English adjectival suffix -i. There was a variant nasky in early Modern English.

Barnhart suggests Old French nastre "miserly, envious, malicious, spiteful," shortened form of villenastre "infamous, bad," from vilain "villain" (see villain) + -astre, pejorative suffix, from Latin -aster. Another alternative etymology [mentioned in OED] is from Dutch nestig "dirty," literally "like a bird's nest."

From c. 1600 as "indecent, obscene" ("morally filthy"). Of weather, "foul, stormy," from 1630s; of things generally, "unpleasant, offensive; troublesome, annoying," from 1705. Of people, "ill-tempered, mean," from 1825. The noun meaning "something nasty" is from 1935. Related: Nastily; nastiness.

Nasty, in England frequently meaning ill-tempered or cross-grained (Slang Dictionary, p. 186), and in this sense admitted into good society, denotes in America something disgusting in point of smell, taste, or even moral character, and is not considered a proper word to be used in the presence of ladies. [M. Schele De Vere, "Americanisms," 1872]
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lucre (n.)

"gain in money or goods, profit," late 14c., from Old French lucre, from Latin lucrum "material gain, advantage, profit; wealth, riches," of uncertain origin. De Vaan says from Proto-Italic *lukro-, from PIE *lhu-tlo- "seizure, gain," with cognates in Greek apolauo "take hold of, enjoy," leia (Doric laia) "booty;" Gothic laun "reward."

Often specifically in a restricted sense of "base or unworthy gain, money or wealth as the object of greed," hence "greed." Filthy lucre (Titus i.11) is Tyndale's rendering of Greek aiskhron kerdos.

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orc (n.)

"ogre, devouring monster," 1590s, perhaps a reborrowing of the same word that became Old English orcþyrs, orcneas (plural), which is perhaps from a Romanic source akin to ogre, and ultimately from Latin Orcus "Hell," a word of unknown origin. Also see Orca. Revived by J.R.R. Tolkien (1892-1973), who might have got it from Beowulf, as the name of a brutal race in Middle Earth.

But Orcs and Trolls spoke as they would, without love of words or things; and their language was actually more degraded and filthy than I have shown it. ["Return of the King," 1955]
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dubiety (n.)

"doubtfulness, dubiousness," 1650s, from Late Latin dubietas "doubt, uncertainty," from Latin dubius "vacillating, fluctuating," figuratively "wavering in opinion, doubting" (see dubious). Earlier in the same sense were dubiosity (1640s), dubiousness (1650s); also see dubitation.

Ignorance is the mother of two filthy daughters; the first daughter of Ignorance is called dubiety, or doubtfulnesse, which is a continual wavering in opinion; a knowing man hath a fixt spirit, and settled judgement, but an ignorant man is a double-minded man, though he be never so resolute and wilful in his opinions. [W. Geering, "The Mischiefes and Danger of the Sin of Ignorance," London, 1659]
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