loquaciousness

This term describes a tendency toward excessive talking, often carrying a nuance of fluency or eloquence. While it can be a neutral description of a personality trait, it frequently leans toward a critical or slightly mocking tone when the speaker implies that the talkativeness is unnecessary or overwhelming.

In professional or academic registers, it is used to describe a stylistic quality of speech or writing. It is distinct from "garrulity," which more strongly suggests triviality or rambling, whereas loquaciousness can imply a sophisticated, albeit voluminous, command of language.