gliddery

from The Collaborative International Dictionary of English v.0.48

Glidder \Glid"der\, Gliddery \Glid"der*y\, a. [Cf. {Glide}.]
   Giving no sure footing; smooth; slippery. [Prov. Eng.]
   [1913 Webster]

         Shingle, slates, and gliddery stones.    --R. D.
                                                  Blackmore.
   [1913 Webster]