When it comes to finding antonyms for the phrase "not harmonious," there are a plethora of options to choose from. Synonyms for "not harmonious" include words such as discordant, clashing, conflicting, out of tune, mismatched, unsynchronized, misaligned, and dissonant. These antonyms paint a vivid picture of things that do not go well together, whether in music or in life. The opposite of harmony is a lack of unity, agreement, and symmetry. Therefore, when things are not harmonious, they may also be chaotic, disorderly, jarring, or even unsettling. Overall, these antonyms remind us of the importance of finding balance and unity in all aspects of life.