perfidious
adj. 背信弃义的；不忠的
例句
Their feet will trample on the dead bodies of their perfidious aggressors.
他们将从背信弃义的侵略者的尸体上踏过。
《柯林斯英汉双解大词典》
Perfidious media managers; treachery in the name of truth.
背信弃义的媒体；打着真相名义的背信弃义。
No wonder they talk about perfidious Albion, he mutters, and you can see why.
他低声嘀咕着，难怪他们都说英国人背信弃义，现在知道为什么了。
