act in bad faith

基本解释

Soon feel like a very nasty person, acting in bad faith of their own people.
很快就覺得自己是一個很討厭的人，對自己言而無信的人。
linxs.lee.blog.163.com
Your acting in bad faith - sometimes I really do not know what I use now to believe you?
你言而無信 - 有時我真的不知道我現在用的要相信你？

From Livni's perspective, the only one acting in bad faith is Netanyahu.
CENTERFORSECURITYPOLICY: Bringing Bibi down
But when the opposite is the case, the ban cannot be expected to work against countries whose governments have a history of acting in bad faith.
CENTERFORSECURITYPOLICY: Chemical Reaction
In the United States, when unions win recognition ballots, they often end up returning to the National Labour Relations Board time and again to try to establish that the employer is acting in bad faith.
ECONOMIST: Labour relations