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Definition of impurity : 1. That which is, or which renders anything, impure; foul matter, action, language, etc.; a foreign ingredient.
2. The condition or quality of being impure in any sense; defilement; foulness; adulteration.
3. Want of ceremonial purity; defilement.

Synonyms:

dross, adulterant, adulteration, lewdness, indecency, clean, pollution, contamination, pollutant, scoria, filth, pornography, dirt, slag, poison, adulterator, germ, contaminator, contaminant, infection, defilement, unwholesomeness, impureness

eyesore, dot, blot, pockmark, scratch, gash, defect, notch, drawback, scrape, stigma, mark, crack, rift, abrasion, deformity, lesion, blister, flaw, scar, defacement, nick, splotch, freckle, brand, spoilage, scuff, imperfection, kink, disfigurement, fracture, fault, tarnish, stain, blemish, speck, score, spot, hole, hack, weal, blotch, hurt, discoloration, distortion, check, chip, wart, sore, slit, mar, damage, scab, fleck

foulness, dustiness, murkiness, grubbiness, putridity, odiousness, uncleanness, shabbiness, filthiness, griminess, sloppiness, untidiness, dinginess, muddiness, smuttiness

dirtiness, slovenliness, uncleanliness, immorality, defectiveness

Usage examples:

• In the afternoon of the Sunday Knox preached, denouncing the morning's proceedings, the " impurity" of the Prayer Book, of which " I once had a good opinion," and the absence, in England, of " discipline," that is, interference by preachers with private life. - "John Knox and the Reformation", Andrew Lang.
• The care with which the impurity had been rendered innocuous demonstrated the correct ideas of the oyster on sanitation. - "Tropic Days", E. J. Banfield.
• I have written a great novel upon Iceland, full of colour, of passion, of the most subtle impurity, yet I could not point you out Iceland upon the map. - "The Green Carnation", Robert Smythe Hichens.