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scum - definition and synonyms

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noun [uncountable]     scum pronunciation in American English
  1. 1
    offensive an insulting word for someone who you think is very unpleasant

    The people who do these terrible things are scum.

  2. 2
    a layer of a dirty or unpleasant substance that forms on the surface of a liquid

    A thick layer of black scum lay on the canal water.

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to manipulate someone psychologically so that they begin to question their own perceptions and memories

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Dunning-Kruger effect

the phenomenon by which an incompetent person is too incompetent to understand his own incompetence

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