"Mouthily" can be synonymous with a few different words and phrases, including "garrulously," "loquaciously," "verbose," "prolix," and "windily." All of these words convey the idea of speaking at length, often to the point of being tedious or annoying. However, they can also suggest a certain charm or wit in the speaker's verbosity, as well as a tendency towards exaggeration or hyperbole. Some other possible synonyms for "mouthily" might include "tediously," "long-windedly," "ambitiously," and "pompously," depending on the specific connotations and contexts that one wants to convey. Ultimately, the best synonym for "mouthily" will depend on the speaker's intended tone and purpose.