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.
例句
These kids are being exploited by very unscrupulous people.这些孩子正在被无良之人利用。...the unscrupulous use of hostages.对人质的无耻利用
英汉词典释义
adj.
肆无忌惮的, 不择手段的, 无道德原则的
It was unscrupulous of their lawyer to withhold evidence.他们的律师隐瞒证据是不道德的。
英英词典释义
Adjective
1. without scruples or principles;
"unscrupulous politicos who would be happy to sell...their country in order to gain power"
2. lacking honesty and oblivious to what is honorable