adjective

having or showing a willingness to act dishonestly in return for money or personal gain.

unscrupulous logging companies assisted by corrupt officials

dishonest,dishonourable,unscrupulous,unprincipled,amoral,untrustworthy,underhand,deceitful,double-dealing,disreputable,discreditable,shameful,scandalous,corruptible,bribable,buyable,venal,fraudulent,swindling,grafting,criminal,lawless,felonious,villainous,nefarious,iniquitous,malfeasant,crooked,shady,tricky,dirty,low-down,rascally,scoundrelly,bent,dodgy,hollow-hearted

verb

cause to act dishonestly in return for money or personal gain.

there is a continuing fear of firms corrupting politicians in the search for contracts

bribe,suborn,buy,buy off,pay off,grease someone’s palm,give someone a backhander,give someone a sweetener,keep someone sweet,get at,fix,square,nobble