Etymology
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filthy (adj.)

late 12c., fulthe, "corrupt, sinful," from filth + -y (2). Meaning "physically unclean, dirty, noisome" is from late 14c. Meaning "morally dirty, obscene" is from 1530s.

In early use often hardly more emphatic than the mod. dirty; it is now a violent expression of disgust, seldom employed in polite colloquial speech. [OED]

Related: Filthily; filthiness.

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squalid (adj.)

1590s, from French squalide and directly from Latin squalidus "rough, coated with dirt, filthy," related to squales "filth," squalus "filthy," squalare "be covered with a rough, stiff layer, be coated with dirt, be filthy," of uncertain origin. Related: Squalidly; squalidness; squalidity.

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dirty (v.)

"to defile; make filthy," 1590s, from dirty (adj.). Related: Dirtied; dirtying.

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hoggish (adj.)
"having the characteristics of a hog," especially "gluttonous, greedy," late 15c., from hog (n.) + -ish. Meaning "slovenly, filthy" is from 1540s. Related: Hoggishly; hoggishness.
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lazar (n.)
"filthy beggar, leper," c. 1300, from Medieval Latin lazarus "leper," from Lazarus (q.v.), the name of the beggar in the biblical parable. Sometimes also lazard, with pejorative suffix.
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squalor (n.)
1620s, "state or condition of being miserable and dirty," from Latin squalor "roughness, dirtiness, filthiness," from squalere "be filthy" (see squalid).
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scummy (adj.)

"covered with scum," 1570s, from scum + -y (2). Transferred sense of "filthy, disreputable" is recorded from 1932. Related: Scumminess.

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foulness (n.)
Old English fulness "foulness, filthy smell;" see foul (adj.) + -ness. Similar formation in Old Frisian fulnisse, Dutch vuilnis, German fäulniss.
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ordure (n.)

late 14c., "dung, excrement, feces; filth, dirt," from Old French ordure "filth, uncleanliness" (12c.), from ord, ort "filthy, dirty, foul," from Latin horridus "dreadful" (see horrid). Related: Ordurous.

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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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