The Collaborative International Dictionary of English v.0.48:

Nill \Nill\ (n[i^]l), v. t. [imp. & p. p. Nilled (n[i^]ld); p.
   pr. & vb. n. Nilling.] [AS. nilan, nyllan; ne not + willan
   to will. See No, and Will.]
   Not to will; to refuse; to reject. [Obs.]
   [1913 Webster]

         Certes, said he, I nill thine offered grace. --Spenser.
   [1913 Webster]