Antonyms for "inveighing against" would include expressing approval or support for something or someone. Praising or commending would be positive antonyms, as well as endorsing or advocating. Other antonyms could include defending, supporting, or championing. These words imply a willingness to stand up for a cause or individual, rather than attacking or criticizing them. Instead of using hostile rhetoric or vitriol, these antonyms suggest a more constructive and positive approach. By offering encouragement and validation, these words can help to build understanding and promote harmony rather than division.