The word "discoursed on" means to discuss, deliver a formal speech or lecture on a specific topic. Antonyms for "discoursed on" would include staying silent, remaining quiet, avoiding discussion, and withholding comments or opinions. A person can also choose to keep their thoughts to themselves, refuse to engage in conversation, or be uncommunicative, which all go against the act of "discoursing on." Conversely, synonyms for "discoursing on" include expounding, expatiating, and elaborating, all of which imply a detailed and extended discussion or explanation. Therefore, the antonyms for "discoursed on" entail a lack of communication or participation, while the synonyms suggest an in-depth and comprehensive dialogue or presentation.