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. 不诚实的; 不道德的
adjective [原级]无道德原则的,肆无忌惮的
These kids are being exploited by very unscrupulous people. 这些孩子正被极不道德的人利用。