The word "more upholstered" implies an increase in the amount or thickness of cushioning or padding in furniture. The antonyms for this term would, therefore, be words that indicate a decrease in cushioning or padding. Synonyms for the term might include terms such as cushioned, padded, or plush, while antonyms could incorporate words like hard, firm, or rigid. Other options might include terms such as low-profile, minimalist, or streamlined, which suggest a focus on simplicity and functionality rather than comfort or extravagance. Ultimately, the antonyms for the term more upholstered will depend on the context in which the word is being used and the specific qualities that the writer or speaker is looking to emphasize or downplay.