felōˈniousness noun

felˈonous adjective (Spenser)

Cruel, ruthless, fell

felˈonry noun

A body of felons

felˈony noun

1. Orig a crime punished by total forfeiture of lands, etc
2. A grave crime, formerly classed legally as one more serious than a misdemeanour (still classed as such in the USA because of the harsher punishments imposed)