They felt as though they had done something discreditable and unclean.他们觉得自己仿佛做了什么龌龊丢脸之事。

unclean thoughts龌龊的想法

He made the sign of the Cross at each wall to drive out the unclean spirits.他在每一面墙上都做了十字圣号以驱散邪灵。