Wordnet 3.0
ADJECTIVE (1)
1. 
 artfully persuasive in speech; 
- Example: "a glib tongue"- Example: "a smooth-tongued hypocrite"[syn: glib, glib-tongued, smooth-tongued]
WordNet (r) 3.0 (2006):
glib-tongued
    adj 1: artfully persuasive in speech; "a glib tongue"; "a
           smooth-tongued hypocrite" [syn: glib, glib-tongued,
           smooth-tongued]