From Dictionary.com
Origin:
1250–1300; ME: foolish, stupid < OF: silly, simple < L nescius ignorant, incapable, equiv. to ne- negative prefix + sci- (s. of scīre to know; see science) + -us adj. suffix
1250–1300; ME: foolish, stupid < OF: silly, simple < L nescius ignorant, incapable, equiv. to ne- negative prefix + sci- (s. of scīre to know; see science) + -us adj. suffix