WordWeb Online

1. Marked by lack of intellectual depth
   "glib generalizations"; "a glib response to a complex question"
    
2. Having only superficial plausibility
   "glib promises";
   - pat, slick
    
3. Artfully persuasive in speech
   "a glib tongue";
   - glib-tongued, smooth-tongued

Derived forms: glibber, glibbest

See also: persuasive, plausible, suasive [rare], superficial

Encyclopedia: Glib