形容词

1. 不诚实的；不道德的；无道德原则的
If you describe a person as unscrupulous, you are critical of the fact that they are prepared to act in a dishonest or immoral way in order to get what they want.

1. without scruples or principles

e.g. unscrupulous politicos who would be happy to sell...their country in order to gain power