feral

[feer-uhl] (adjective)
ADJ
1: of, relating to, or suggestive of a wild beast 2a: not domesticated or cultivated : wild b: having escaped from domestication and become wild

Existing in a wild or untamed state, especially after escape from captivity or domestication.

SYNONYMS

wild untamed undomesticated savage

ANTONYMS

tame domesticated civilized
After years of neglect, the once gentle pet had turned feral, shying away from human contact.