perfidious + noun
常用于形容人的背叛行为，语气正式。
The perfidious ally betrayed our plans.
那个不忠的盟友背叛了我们的计划。
背信弃义的；不忠的；奸诈的
与背信弃义有关的；不忠于应效忠对象的。；背信弃义的；尤其指罗马人认为迦太基人具有的背叛性格；不忠贞的；背信的；有异心的
treacherous; disloyal; betraying trust.
与背信弃义有关的；不忠于应效忠对象的。
Of, pertaining to, or representing perfidy; disloyal to what should command one's fidelity or allegiance.
背信弃义的；尤其指罗马人认为迦太基人具有的背叛性格
tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans
The perfidious ally revealed our plans to the enemy.
那个不忠的盟友把我们的计划泄露给了敌人。
用法提示：形容词“perfidious”描述盟友的背信弃义行为。
AI contextual example
She discovered his perfidious nature when he lied about his past.
当她发现他对自己过去撒谎时，才看清他背信弃义的本质。
用法提示：形容词“perfidious”修饰“nature”，表示不忠贞的性格。
AI contextual example
The perfidious employee stole company secrets and sold them to competitors.
那个背信弃义的员工窃取了公司机密并卖给了竞争对手。
用法提示：形容词“perfidious”形容员工的背信行为。
AI contextual example
常用于形容人的背叛行为，语气正式。
The perfidious ally betrayed our plans.
那个不忠的盟友背叛了我们的计划。
His actions were perfidious and caused great harm.
他的行为背信弃义，造成了巨大伤害。
Many considered him perfidious after the incident.
事件发生后，许多人认为他背信弃义。
grammar · medium
易错句子He gave a perfidious wave.
正确表达He gave a perfunctory wave.
混淆了 perfidious（背信弃义的）和 perfunctory（敷衍的）的含义。描述敷衍的举动应使用 perfunctory。
grammar · medium
易错句子He is a perfidious.
正确表达He is perfidious.
将形容词 perfidious 误用作名词。形容词应直接作表语，或后接名词如 person。
两者都表示不忠，但treacherous更强调奸诈欺骗，perfidious更强调背信弃义，常指背叛信任。
perfidious与pernicious发音相似但意义完全不同；perfidious表背信，pernicious表有害，常指缓慢造成损害。
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