hindsight critic (noun) Monday morning quarterback: second-guesser
Sinonime: articulate, big-mouthed, chattering, chatty, conversational, effusive, eloquent, fluent, full of hot air, gabby, garrulous, glib, gossipy, long-winded, loose-lipped, loquacious, loudmouthed, mouthy, multiloquent, prolix, rattling, slick*, smooth*, verbal, verbose, vocal, voluble, windy, wordy