adj.(对国家、家庭等)不忠实的，不忠诚的，(对朋友等)不守信义的

He was disloyal to his country and betrayed the trust of his fellow citizens.
他对他自己的国家不忠，并辜负了同胞们的信任。
The employee's disloyalty led to his termination from the company.
该员工的不忠导致他被公司解雇。
She accused her friend of being disloyal after she revealed the secret.
她指责朋友泄露了秘密，认为她是不忠诚的。
His disloyal behavior caused a rift within the family.
他的不忠行为在家族中造成了分裂。
A disloyal spy can leak crucial information to the enemy.
叛徒间谍可能会向敌人泄露重要情报。
Disloyal customers tend to switch brands easily.
不忠诚的顾客往往容易转向其他品牌。
His disloyal attitude towards his boss led to a poor work environment.
他对上司的不忠诚态度导致了工作环境恶化。
The disloyal servant was punished severely by the master.
对主人不忠的仆人受到了严厉的惩罚。
In times of adversity, true friends remain loyal, while disloyal ones disappear.
在困难时期，真正的朋友会保持忠诚，而那些不忠的则会选择离开。
The disloyal partner's affair shattered the once-happy marriage.
不忠的伴侣的外遇摧毁了曾经美满的婚姻。