Adjectives

(s)facile, neat, slicksuperficially impressive, but lacking depth and attention to the true complexities of a subject“too facile a solution for so complex a problem”, “it was a neat plan, but bound to fail”, “a slick advertising campaign”
(s)facileperforming adroitly and without effort“a facile hand”
(s)eloquent, facile, fluent, silver, silver-tongued, smooth-spokenexpressing yourself readily, clearly, effectively“able to dazzle with his facile tongue”, “silver speech”