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Yes, validate is an antonym of denounce.
The peasants were not allowed to denounce their king.
Condemn, demur, denounce, denounce, deny, protest, refuse, and prohibit.
Denounce is a verb that means to criticize something or someone strongly.
We must denounce injustice and oppression.
To denounce someone is publicly insulting them in their face, and basically making it known to the world that they are untrustworthy.