rotter
From Longman Dictionary of Contemporary Englishrotterrot‧ter /ˈrɒtə $ ˈrɑːtər/ noun [countable] British English old-fashionedBAD PERSON an unpleasant person who treats other people badlyExamples from the Corpusrotter• He might be all the rotters of the universe, but he had a gentle, magical touch with the child.