duplicity

他的两面派行为在同时讨好老板和同事时暴露无遗。

His ___duplicity was revealed when he tried to please both the boss and his coworkers at the same time.

她因同时在两家公司工作且对双方都隐瞒事实而被指控欺骗行为。

She was accused of ___duplicity for working at two companies simultaneously while hiding the fact from both.