faithless /ˈfeɪθlɪs/

• 1. 

  ADJ If you say that someone is faithless, you mean that they are disloyal or dishonest. 不忠实的; 不诚实的

  例：

  She decided to divorce her increasingly faithless and unreliable husband.

  她决定要跟她那越来越不忠实也靠不住的丈夫离婚。