The Collaborative International Dictionary of English v.0.48:

Unscience \Un*sci"ence\, n.
   Want of science or knowledge; ignorance. [Obs.]
   [1913 Webster]

         If that any wight ween a thing to be otherwise than it
         is, it is not only unscience, but it is deceivable
         opinion.                                 --Chaucer.
   [1913 Webster]