prig

他在派对上拒绝跳舞，表现得像个古板的人。

He refused to dance at the party, acting like a ___prig.

她总是指责别人不环保，表现得像个自以为是的道德家。

She always criticizes others for not being eco-friendly, acting like a ___prig.

她表现得像个道学先生，总是对别人的生活方式指手画脚。

She acts like such a ___prig, constantly criticizing how others choose to live.