The term "most upperclass" typically refers to the highest social stratum in a society or community. Its antonyms, or opposites, may include terms such as "working class," "middle class," or "lower class." These terms represent different levels of socioeconomic status and social mobility, with the working class typically consisting of lower-paid manual laborers, the middle class representing a broad range of professions and income levels, and the lower class indicating poverty or economic hardship. Other possible antonyms may include terms such as "uneducated," "unrefined," or "uncultured," which emphasize a lack of social or intellectual sophistication. Overall, the antonyms of "most upperclass" highlight the diversity and complexity of social stratification and its impact on people's lives.