The very opposite of an Honorable Villain, these villains resort to cheating to win. As most conflicts in fiction are matters of life and death/Good vs. Evil and thus have no actual "rules," most characters in this category come from stories involving some sort of contest. However, it is possible for these categories to overlap.

Cheaters can also be involved in infidelity.

Their heroic counterparts are often much more capable of being honorable than these pragmatists do; exceptions would only qualify if the villain stops cheating and plays fair.