The word "one onlies" typically refers to people or things that are unique or singular. Therefore, its antonyms would be plural nouns that refer to a group of people or things, such as "many," "several," "numerous," or "countless." Another possible antonym for "one onlies" could be the word "ordinary," which would imply that the person or thing in question is not unique or exceptional. Other antonyms might include "common," "usual," "typical," or "run-of-the-mill." Regardless of the specific antonym used, the opposite of "one onlies" would suggest a lack of individuality or distinctiveness.