Source : Webster's Revised Unabridged Dictionary (1913)

Gilbbery \Gilb"ber*y\, a.
   1. Slippery; changeable. [Obs.]

            My love is glibbery; there is no hold on't.
                                                  --Marston.

   2. Moving easily; nimble; voluble. [Obs.]

            Thy lubrical and glibbery muse.       --B. Jonson.