Repudiate
Part of speech: verb
Definition: To reject the truth or validity of something; to deny. To refuse to have anything to do with; to disown. To refuse to pay or honor (a debt).
Renounce
Part of speech: noun
Definition: An act of renouncing.
Part of speech: verb
Definition: To give up, resign, surrender.To cast off, repudiate.To decline further association with someone or something.To abandon, forsake, discontinue (an action, habit, intention, etc), sometimes by open declaration.To make a renunciation of something.To surrender formally some right or trust.(cards) To fail to follow suit; playing a card of a different suit when having no card of the suit led.
Example sentence: We have become aware of the responsibility for our attitude towards the dark pages in our history. We have understood that bad service is done to the nation by those who are impelling to renounce that past.