“Discourse” can refer to a conversation, discussion, or written or spoken communication on a particular topic. Some possible antonyms for “discourse” could be “silence” and “isolation”.
“Silence” is the absence of speech or sound. While discourse involves communication and exchange of ideas, silence is the opposite, a state where there is no verbal interaction. For example, “The room was filled with lively discourse earlier, but now there is only silence.” This shows the stark contrast between the two.
“Isolation” implies being separated or cut off from others. Discourse usually occurs when people interact and engage with one another. In isolation, there is no opportunity for discourse. “His self-imposed isolation meant there was no discourse with others.” This highlights how isolation stands in opposition to the concept of discourse.