The word "consonantly" is an adverb that means in a harmonious or consistent manner. Therefore, some possible antonyms for this word might include "inconsistently," "discordantly," "inharmoniously," "uncoordinatedly," and "dissonantly." Whereas consonantly describes a sense of agreement and unity, its antonyms connote a lack of coherence, coordination, and harmony. Additionally, "unevenly," "irregularly," "haphazardly," and "sporadically" could also serve as antonyms, as they describe actions that are not performed in a consistent or regular way. Understanding the meaning and the antonyms of a word is essential in building a rich and varied vocabulary.