The Collaborative International Dictionary of English v.0.48:

Gril \Gril\ (gr[i^]l), a. [OE. gril harsh; akin to G. grell
   offending the ear or eye, shrill, dazzling, MHG. grel angry;
   cf. AS. gallan to provoke.]
   Harsh; hard; severe; stern; rough. [Obs.] --Rom. of R.
   [1913 Webster]