The Collaborative International Dictionary of English v.0.48:

Steepy \Steep"y\ (-[y^]), a.
   Steep; precipitous. [Poetic]
   [1913 Webster]

         No more, my goats, shall I behold you climb
         The steepy cliffs, or crop the flow'ry thyme. --Dryden.
   [1913 Webster]