The antonyms of the phrase "more harmonizing" include discordant, disharmonious, inharmonious, unmelodious, unharmonious, and unbalanced. These are words that describe sounds, music or even relationships that are not in sync. Discordant sounds clash and do not produce a pleasant melody, and disharmony is a lack of agreement or accord. Inharmonious describes things that do not blend together, and unmelodious refers to sounds that are not pleasing to the ear. Unharmonious suggests that something does not fit well or is incompatible. Finally, unbalanced means that different elements are not in a proper proportion or harmony. Using these words, one can create a clear and precise communication with the opposite meaning of "more harmonizing.