The phrase "going well with" implies compatibility, harmony, and agreement. However, there are several antonyms that convey the opposite meaning. One antonym is "clashing," which suggests a lack of coordination or coherence. Another antonym is "incompatible," which implies that two things cannot coexist or work together. "Contrasting" is another antonym that denotes noticeable differences, as opposed to similarities. Conversely, "discordant" suggests conflict or disagreement. Lastly, "dissenting" implies opposition or conflicting opinions. In general, antonyms for "going well with" indicate disparity, disagreement, or lack of agreement, highlighting the importance of considering the compatibility of things that are paired together.