The word "more ex" does not exist in the English language, but the word "ex" on its own is a prefix meaning "former" or "out of." Antonyms for "ex" could include "current," "active," or "present." It all depends on the context in which "ex" is being used. For example, if someone says they are an "ex-employee" of a certain company, the antonym for "ex" would simply be "employee," as opposed to "former employee." Similarly, if someone refers to an "ex-partner," the antonym would be "current partner." In short, antonyms for "ex" depend on the word or phrase in which it is used.