taint
noun
verb
1 the world's last great wilderness is being tainted by pollution:
contaminate, pollute, adulterate, infect, blight, befoul, spoil, soil, ruin, destroy.
▷antonyms clean.
2 fraudulent firms need to be weeded out, lest they taint the reputation of all firms:
tarnish, sully, blacken, stain, besmirch, smear, blot, blemish, stigmatize, mar, corrupt, defile, soil, muddy, foul, dirty, damage, injure, harm, hurt, debase, infect, poison, vitiate, drag through the mud, blot one's copybook;
brand.
▷antonyms improve.