Consonancy is defined as the state of agreement or harmony between things. Its antonyms, on the other hand, are the words that describe a lack of agreement or harmony. The antonyms for consonancy can include discordance, disunity, disagreement, inconsistency, incongruity, and disharmony. Discordance refers to the absence of agreement or harmony, while disunity pertains to the state of being divided or separated from one another. Moreover, disagreement entails a difference in opinion or belief, while inconsistency represents a lack of stability or predictability. Incongruity, meanwhile, describes a lack of correspondence or compatibility, whereas disharmony refers to a state of discord or conflict.