Antonyms for the phrase "sung the praises of" include denounce, criticize, condemn, censure, scold, fault, blame, and reprimand. Instead of praising or commending someone or something, these antonyms suggest a negative judgment or condemnation. For example, denouncing a political leader's actions, criticizing a product's flaws, blaming someone for a mistake, or reprimanding an employee for poor performance. While sung the praises of can express admiration and approval, the antonyms reveal a critical attitude that is often accompanied by dissatisfaction or disappointment. These antonyms can help to convey a more balanced and nuanced perspective on people or things, rather than always emphasizing their virtues.