Consentaneity is an uncommon word that refers to the state of being consistent or harmonious. If you're looking for synonyms to use instead of consentaneity, you can consider terms such as coherence, congruence, compatibility, accord, or concordance. All of these words indicate a sense of agreement or consistency between different elements. Other options might include conformity, adherence, or uniformity, which suggest a stricter adherence to a particular set of standards or principles. Ultimately, the word you choose will depend on the specific context and intended meaning, but any of these words could be used to convey a similar sense of consistency or harmony.