Crudelis: Latin To delight in blood and gore. Over time this word came to mean being vicious and cruel
The word Crudelis comes from an even older word in Proto-Indo-European, simply Kru which means blood, gore and viscera.
Kru words show up in the English language a lot in association with bloody and awful deaths.
Cruentous: Bloody (from Latin)
Cruentation: The ooze of blood when a body is cut open (Medical)
Recrudescence: To begin bleeding again (Medical)
Cruet: A small wine bottle that contains red wine/the blood of Christ during Mass.
Crucifixion: A cross made of fastened together tree trunks in an X shape, used as an instrument of torture and death.
Excruciating: The word originally coms from the pain of a crucifixion on the cross.
Crochet: A form of needle-work using a little hook.
Kruella De Ville: the notorious character from the Disney film 101 Dalmatians who wanted to skin the poor little doggies alive!
An Etymological Dictionary of the English Language By Walter W. Skeat (1910)
A Concise Dictionary of Middle English From A.D. 1150 To 1580 by A. L. Mayhew and Walter W. Skeat (1888)