"Discreditor" is a word in ENGLISH

discreditor ENGLISH
Definition:

One who discredits.

Few words of positivity

Adora Belle fought back, and to make sure fought back even before she was attacked.

Terry Pratchett, Going Postal

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Discredit LAW AND LEGAL

To destroy or impair the credibility of a person; to Impeach; to lessen the degree of credit to be accorded …

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impeach ENGLISH

Hence, to charge with impropriety; to dishonor; to bring discredit on; to call in question; as, to impeach one's motives …

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Liberam Legem Amittere LAW AND LEGAL

To lose one’s free law, (called the. villainous judgment,) to become discredited or disabled as juror and witness, to forfeit …

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slander ENGLISH

To bring discredit or shame upon by one's acts.

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Vtllenous Judgment LAW AND LEGAL

A Judgment which deprived one of his libera lex, whereby he was discredited and disabled as a juror or witness; …

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