scum

US /skʌm/

UK /skʌm/

B2
n. (u.)Uncountable NounLayer of unpleasant stuff forming on top of liquid
The scum on top of the river was so disgusting I couldn't step into it
n. (c./u.)Noun (Countable/Uncountable)Person of very poor character, who is despised
She is total scum, so if you stay friends I don't want to hang out anymore
n. (c./u.)Noun (Countable/Uncountable)A person considered unpopular or low-life
Thieves and murderers are the scum of the earth

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