unscrupulous

Example:His immoral actions led him to lose the respect of his peers.

Definition:Contrary to commonly accepted principles of right and wrong; unethical.

Example:The dishonest trader was caught cheating customers of their hard-earned money.

Definition:Not telling the truth or not being honorable in one's dealings.

Example:He was a scoundrel, notorious for his unscrupulous dealings in the black market.

Definition:A morally corrupt and deceitful person