If you denounce a person or an action, you criticize them severely and publicly because you feel strongly that they are wrong or evil. German leaders denounced the attacks and pleaded for tolerance Some 25,000 demonstrators denounced him as a traitor
To criticize or speak out against (someone or something); to point out as deserving of reprehension or punishment, etc.; to openly accuse or condemn in a threatening manner; to invoke censure upon; to stigmatize; to blame
to accuse or condemn or openly or formally or brand as disgraceful; "He denounced the government action"; "She was stigmatized by society because she had a child out of wedlock"
speak out against; "He denounced the Nazis" give away information about somebody; "He told on his classmate who had cheated on the exam" announce the termination of, as of treaties