Hellhound

n.

1.

A dog of hell; an agent of hell. A hellhound, that doth hunt us all to death. - Shak.

Noun	1.	hellhound - a very evil man
	2.	hellhound - (Greek mythology) 3-headed dog guarding the entrance to Hades; son of Typhon Synonyms: Cerberus

bad hat, mischief-maker, trouble maker, troublemaker, troubler