Sequacity is a relatively uncommon word that refers to the tendency to be excessively talkative or to go on and on about unimportant matters. There are several synonyms that can be used to express a similar meaning, such as verbosity, loquaciousness, or garrulousness. These terms all suggest a tendency to talk too much or to use too many words when communicating. Other synonyms for sequacity might include prattling, babbling, or chattering, which emphasize the idea of talking non-stop or without much point or purpose. Ultimately, the choice of synonym will depend on the context and tone of the writing, but all of these words convey a sense of excess when it comes to verbal expression.