Degenerate

degenerate [ v. di-JEN-uh'-reyt; adj., n. di-JEN-er-it ]
[ noun, verb, adjective ]

MEANING :
1. (adj.) having lost the qualities appropriate to humankind
2. (adj.) having sunk below the desired level of moral qualities
3. (n.) a person who has fallen from a normal standard of moral character
4. (tr. v.) to sink below the normal standard in mental, physical or moral qualities
5. (intr. v.) to bring about deterioration

USAGE EXAMPLE 1 :
He was shunned by society because he was a degenerate person

USAGE EXAMPLE 2 :
The Hamas-organized rally began peacefully but degenerated into violence with hundreds of Palestinians throwing rocks across the border wall.