Her vice takes hold of her again, but she still refrains until some moment when, gnawed by some hideous caprice, she comes aground like a mournful wreck ruined by lust, in the midst of her own banal, perfidious pollution. - Jean Lorrain
The point I am trying to make is that words are a mysterious, ambiguous, ambivalent, and perfidious phenomenon. They can be rays of light in a realm of darkness. . . . They can equally be lethal arrows. Worst of all, at times they can be one or the other. They can even be both at once! - Václav Havel
The most perfidious way of harming a cause consists of defending it deliberately with faulty arguments. - Friedrich Nietzsche
There is nothing more shameful than perfidious friendship. - Marcus Aurelius