fluent

facile, glib, smooth-tongued, voluble

expressive, outspoken, verbal, vocal

blabby, chatty, garrulous, loquacious, talkative, verbose

unfaltering, unhesitating

circumfluent, circumfluous

diluted, thin, watery, weak

semiliquid, semisolid

idiotproof, mindless, quick, straightforward, unchallenging, uncomplicated

apparent, clear, clear-cut, distinct, evident, manifest, obvious, open-and-shut, palpable, patent, perspicuous, plain, transparent, unambiguous, unequivocal, unmistakable