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noun
substance that causes harm, death
Synonyms: adulteration, bacteria, bane, blight, cancer, contagion, contamination, corruption, germ, infection, malignancy, miasma, toxicant, toxin, toxoid, venin, venom, virus
Antonyms: antidote
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verb
contaminate, pollute
Synonyms: adulterate, corrupt, debase, defile, deprave, destroy, envenom, fester, harm, infect, injure, kill, make ill, murder, pervert, stain, subvert, taint, undermine, vitiate, warp
Antonyms: purify, sterilize
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adjective
harmful
Synonyms: bad, baleful, baneful, corrupt, corruptive, dangerous, deadly, deleterious, destructive, detrimental, evil, fatal, hurtful, infective, lethal, malicious, malignant, mephitic, miasmatic, morbid, mortal, nocuous, noisome, noxious, peccant, pernicious, pestiferous, pestilential, septic, toxic, toxicant, toxiferous, venomous, vicious, viperous, virulent
Antonyms: aiding, antidotal, assisting, curing, healing, helpful