The term "most congenerous" refers to the highest degree of similarity or likeness between two or more things. When looking for its antonyms, you can take into consideration words such as dissimilar, unlike, incongruous, disparate, or divergent. Unlike the word "congenerous", all of these terms reflect the lack of agreement, harmony, or compatibility. They indicate a clear difference or contrast between two or more things, rather than the presence of similarities. When looking for an antonym for "most congenerous", it is essential to focus on words that reflect divergence, separation, or differences, as they are the opposite of what the original word stands for.