Antonyms for the phrase "cast aspersions upon" could include "praise," "commend," "honor," "uplift," or "flatter." Rather than making negative or unfounded remarks about someone or something, these antonyms suggest recognizing and lauding their positive qualities. By choosing to use these words instead of "cast aspersions upon," one can promote a more positive and respectful tone in communication. Additionally, practicing the use of positive language can contribute to building stronger, more supportive relationships with others. It is important to be mindful of the words we choose and their impact on others.