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rotter (n.)

"person deemed objectionable on moral grounds," 1889, slang, from rot (v.) + -er (3).

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Definitions of rotter from WordNet

rotter (n.)
a person who is deemed to be despicable or contemptible;
only a rotter would do that
Synonyms: dirty dog / rat / skunk / stinker / stinkpot / bum / puke / crumb / lowlife / scum bag / so-and-so / git
From wordnet.princeton.edu