Rapscallion

Besides the fact that it's just fun to say, this word is also useful when you want to refer to someone who is dirty, nasty and unethical, but you don't want to swear. For example, after watching Diego Costa's shameful circus show for Chelsea against Arsenal in this weekend's football match, I could call him a lot of things. But I'll just stick with rapscallion. Publically, at least.