The antonyms for the word "un-harmonious" are many and varied, depending on the context in which the word is used. In general terms, some possible antonyms include "harmonious," "compatible," "agreeable," "congenial," "coherent," "blended," "balanced," "pleasant," "concordant," and "tuned." These words all suggest a sense of balance, agreement, and pleasantness, or a general sense of unity and agreement. Conversely, "un-harmonious" describes a situation or state of being that is dissonant, discordant, unpleasant, or generally not agreeable. By using these antonyms in the appropriate context, writers and speakers can emphasize the positive qualities of a situation and avoid negative connotations.