The term "more king-size" implies something larger or grander than a standard king-size. Therefore, the antonyms for this term would be smaller or less grandiose. Words that could be used as an antonym include compact, petite, tiny, miniature, and smaller. These words suggest the opposite of large or grand, and are a good choice when a smaller option is desired. By using these antonyms, speakers and writers can convey a sense of humility, restraint, or practicality, which can be valuable in a range of contexts. So, if you're looking for a way to describe something that's the opposite of "more king-size," these words are a great place to start.