The antonyms for the word "more unalloyed" can include phrases such as "less pure," "impure," "adulterated," or "mixed." Essentially, any term that implies a lack of purity or a reduction in quality could be considered an antonym for "more unalloyed." Other terms that may fit this description include "tainted," "corrupted," "contaminated," or "polluted." It's worth noting that these terms could have slightly different implications depending on the context of their use, but in a general sense, they could all be considered antonyms for "more unalloyed.