adj.不忠诚的，不可信任的，不可信赖的

He was accused of being faithless to his wife after pictures emerged of him with another woman.
他被指控对妻子不忠，因为有他与另一名女子在一起的照片被曝光。
The faithless friend betrayed his trust by sharing his secrets with everyone.
那个不可信赖的朋友背叛了他的信任，把他的秘密告诉了所有人。
In the novel, the protagonist discovers that her partner has been faithless for years.
在这本小说中，主角发现她的伴侣多年来一直不忠。
It's hard to forgive someone who has proven themselves faithless time and again.
很难原谅那些一再证明自己不可信赖的人。
The faithless servant stole from his master and fled the city.
那个不忠诚的仆人从主人那里偷了东西后逃离了城市。
After the scandal, the politician was labeled as faithless by the media.
丑闻之后，媒体给这位政治家贴上了“不忠”的标签。
She felt deeply hurt by her faithless partner's constant lies.
她对不忠伴侣的持续谎言感到非常受伤。
The faithless employee leaked confidential information to a rival company.
那个不忠的员工将机密信息泄露给了竞争对手公司。
His faithless behavior in the past makes it difficult for me to trust him now.
他过去不忠的行为让我现在很难信任他。
The faithless guardian abandoned the child in their hour of need.
那个不负责任的监护人在孩子最需要的时候抛弃了他。