"rotter" in the noun sense

1. rotter, dirty dog, rat, skunk, stinker, stinkpot, bum, puke, crumb, lowlife, scum bag, so-and-so, git

a person who is deemed to be despicable or contemptible

"only a rotter would do that"

"kill the rat"

"throw the bum out"

"you cowardly little pukes!"

"the British call a contemptible person a `git'"

Source: WordNet® (An amazing lexical database of English)

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