pervert, vitiate, degrade, bribe, suborn, adulterate, depreciate, deprave, debauch, defile, demoralize, pollute, taint, contaminate, infect, stain, spoil, ruin, alloy, bastardize, blight, blemish, mark against, undermine, subvert, impair, mar, injure, harm, hurt, damage, deface, disfigure, deform, abuse, mistreat, misuse, dishonor, disgrace, despoil, violate, demean, lower, pull down, reduce, weaken, abase, poison, warp, mislead, misguide, cause to degenerate, cause to deteriorate; see also bribe.
To render inaccurate
falsify, misrepresent, misstate, alter, garble, disguise, color, gloss over, varnish, counterfeit, adulterate, contaminate, taint, fabricate, invent, twist, warp, tamper with, doctor, fix*, pad*; see also disguise, forge 1. See syn. study at debase.
Characterized by graft
dishonest, crooked, underhanded, venal, mercenary, fraudulent, unscrupulous, profiteering, extortionate, taking bribes, bribable, unethical, shady*, on the pad*, on the take*, fixed*, bought*, crooked as a dog's hind leg*; see also dishonest 1, 2.
Utterly reprehensible in nature or behavior:degenerate, depraved, flagitious, miscreant, perverse, rotten, unhealthy, villainous. See clean, good
Marked by dishonesty, especially in matters of public trust:dishonest, venal. (Informal) crooked. See honest
Ruthlessly seeking personal advantage:mercenary, praetorian, venal. (Informal) crooked. See self
To ruin utterly in character or quality:animalize, bastardize, bestialize, brutalize, canker, debase, debauch, demoralize, deprave, pervert, stain, vitiate, warp. See clean, help
To make morally impure:contaminate, defile, infect, pollute, soil, taint. See clean