Dis-harmonious, meaning lacking harmony or agreement, can have several antonyms that denote a sense of order, agreement, and harmony. Some of the antonyms for dis-harmonious might include congruous, coherent, compatible, cohesive or harmonious itself. Congruous, which shares the Latin root that means "together," suggests a harmonious relationship among different parts or elements. Coherent, meaning logically consistent, describes ideas that work together for the same effect, devoid of any contradiction. Compatible represents a lack of conflict or clash, and cohesive signifies the power of sticking together, similar to harmonious that shows a clear lack of conflict or disharmony, with all the elements working in a coordinated fashion.