Also Note: E-NED (A New English Dictionary on Historical Principles, James Murray) only lists an entry for:
(adj.) ? glib-tongued
(See second example below)
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From: All The Year Round
A Weekly Journal. Conducted by Charles Dickens.
No. 294, Third Series. Saturday, August 18, 1894. Price Twopence.
(example showing adjective form)
From: The Fraternitye of Vacabondes;
As Wel of Ruflyng Vacabondes, as of Beggerly, of Women as of Men,
of Gyrles as of Boyes
By John Awdely, 1575
The XXV Orders of Knaves Otherwise Called A Quartern of Knaves
Confirmed For Ever by Cocke Lorell