idle > futile
4 And found no place its deadly point to rest. 5 Exceeding rage inflamed the furious beast, 6 To be avenged of so great despite;
so > such a despite > outrage; act of defiance
7 For never felt his impierceable breast
impierceable > {Not pierceable}
8 So wondrous force from hand of living wight;
So > Such wight > being, person, mortal
9 Yet had he proved the power of many a puissant knight.
proved > tested puissant > powerful
111.18