The word "de-mystify" refers to removing the mystery or complexity from something. The antonyms for this word can include "mystify," meaning to make something mysterious or confusing. Other antonyms include concepts such as "complicate," "enigmatize," or "obfuscate," which refer to adding confusion or complexity to something. On the other hand, "clarify," "elucidate," or "simplify" may also be considered antonyms of "de-mystify," as they refer to making something clearer or easier to understand. Ultimately, the antonym of "de-mystify" depends on the context in which it's being used, and the opposite concept that's most fitting to that particular situation.