Unscrupulous (adjective)

1. Not having or showing a strict regard for what is right or proper; not scrupulous.
2. Not honest or fair; deceitful.

Origin:

From the prefix "un-" meaning not, and "scrupulous" meaning having or showing a strict regard for what is right or proper.

Examples:

1. The company has been accused of using unscrupulous business practices to gain an advantage over its competitors.
2. He was known as an unscrupulous businessman who would do anything to make a profit.
3. The politician was criticized for her unscrupulous behavior during the campaign.
4. She felt that she had been taken advantage of by an unscrupulous salesman.
5. He was an unscrupulous con artist who preyed on people's vulnerabilities.