Definition of "slee"

slee

adjective
comparative sleer, superlative sleest
1. (dialectal, chiefly Northern England and Scotland) Alternative form of sly
  Quotations
  The beast of foot sings Holdfast only,For flesh is bruckle and foot is slee.Strength to the strong and the lordly and lonely,Timor Mortis Exultat Me.
  1958, T[erence] H[anbury] White, chapter VIII, in The Once and Future King, New York, N.Y.: G. P. Putnam's Sons, book I (The Sword in the Stone)