Loquacious, a.
Etymology: [L. loquax, -acis, talkative, fr. loqui to speak; cf. Gr.
1. Given to continual talking; talkative; garrulous. Loquacious, brawling, ever in the wrong. Dryden.
2. Speaking; expressive. [R.] J. Philips.
3. Apt to blab and disclose secrets.
Syn. -- Garrulous; talkative. See Garrulous.
Shades of meaning
Fernald has no entry of its own for loquacious; he lists it under garrulous.
Where he writes about it:
The talkative person has a strong disposition to talk, with or without an abundance of words, or many ideas; the loquacious person has an abundant flow of language and much to say on any subject suggested; either may be lively and for a time entertaining; the garrulous person is tedious, repetitious, petty, and self-absorbed. — from garrulous
We speak of a chattering monkey or a chattering idiot, a talkative child, a talkative or loquacious woman, a garrulous old man, a verbose writer. — from garrulous