1. He became the CEO of this company by unscrupulous means.2. The nation's president sought social and financial advancement by unscrupulous means, and finally was overthrown by the people.
unscrupulousunscrupulous 是最貼切的英文，貼切的形容「不正當」跟「不道德」.He became the CEO of this company by unscrupulous means = 他以不正當的手段得到公司執行長的位子
It is indecet of him to take money away from his divorced wife.