He had no scruples about spying on her.

他肆无忌惮地暗中盯着她。

《牛津词典》

Diana openly dwelled on her extramarital relationships with such gusto that she evidently had no scruples whatever about washing her dirty linen in pubic.

（戴安娜公开详谈自己的私情，谈得那么津津有味，显然是完全不怕家丑外扬的了）。

youdao

Diana openly dwelled on her extramatrital relationships with such gusto that she evidently had no scruples whatever about washing her dirty linen in public.

戴安娜公开详谈自己的私情，谈得那么津津有味，显然是完全不怕家丑外扬。

youdao

The agency had no scruples about dealing with unsavouries like Abu Hassan Salameh, Arafat's right-hand man.

BBC

This would be followed by sage lamentations about how a "Christianist" military had indicted a patriotic Muslim-American simply for having religious scruples about the justice of our wars.

CENTERFORSECURITYPOLICY: Major Hasan: the counterlife