The word in-harmonic refers to something that is not in harmony or agreement with other things. Its antonyms include harmonious, compatible, agreeable, concordant, coherent, consonant, and coordinated. When an environment or a musical piece is described as in-harmonic, it suggests that there is a lack of balance or unity. In contrast, a harmonious setting implies that everything is in sync and a state of peace and tranquility exists. The opposite of in-harmonic would be a place or situation where different elements work well together, complementing each other, and creating a sense of cohesion.