Adjectives

(s)glibmarked by lack of intellectual depth“glib generalizations”, “a glib response to a complex question”
(s)glib, pat, slickhaving only superficial plausibility“glib promises”, “a slick commercial”
(s)glib, glib-tongued, smooth-tonguedartfully persuasive in speech“a glib tongue”, “a smooth-tongued hypocrite”