The phrase "in consonant" refers to something that agrees or is consistent with something else. Its antonyms can be words such as "discordant," which refers to something that is not in agreement or harmony, and "dissonant," which refers to a lack of harmony or unpleasant noise. Other antonyms for "in consonant" include "conflicting," which implies two or more things have opposite opinions, "incompatible," which refers to something that cannot coexist, and "discrepancy," which suggests a disagreement or difference between two or more things. These antonyms highlight the opposite meanings of "in consonant," which imply a lack of agreement, harmony, or consistency.