Fellness

Origin

From fell + -ness.

Full definition of fellness

Noun

1. The state or quality of being fell; awfulness, horror, cruelty.
• 1590, Edmund Spenser, The Faerie Queene, II.viii:For very felnesse lowd he gan to weepe,
  And said, Caytiue, cursse on thy cruell hond ....