The antonym for the word "most multifold" would be "least singular" or "least diverse." These terms suggest that something is simple, uncomplicated, or lacks variety. "Least singular" implies that something is not unique or exceptional, while "least diverse" suggests that something lacks complexity or variation. Both of these antonyms contrast with "most multifold," which describes a situation, object, or concept that is highly complex, diverse, or multifaceted. By understanding the antonyms of "most multifold," we can gain a deeper appreciation of the complexity and richness of the world around us.