The word "devaluate" refers to the act of reducing the value or worth of something. Its antonyms, on the other hand, are words that express the opposite meaning. Such antonyms include "appreciate," "enhance," "increase," "strengthen," "improve," and "uplift." These words denote the process of adding value or worth to something, whether it's a product, service, or idea. While "devaluate" implies a negative connotation, its antonyms indicate positive and favorable actions. Therefore, when seeking to express the opposite meaning of "devaluate," there are several options of antonyms that can be used to indicate a positive and beneficial action.