feral

Short definition from Wiktionary

Adjective

1. 1
   Wild; untamed.
2. 2
   Wild; untamed: Of an animal, wild but descended from domestic or captive ancestors; thus, in the wild, although not necessarily of the wild type.
3. 3
   Wild; untamed: Of a person, contemptible; unruly; misbehaved.
4. 4
   Wild; untamed: Behaving in an out-of-control way due to enthrallment with a certain thought, behavior, person, etc.
5. 5
   Wild; untamed: That is a feral character.
6. 6
   Deadly, fatal.
7. 7
   Of or pertaining to the dead, funereal.

Noun

1. 1
   A domesticated (non-human) animal that has returned to the wild; an animal, particularly a domesticated animal, living independently of humans.
2. 2
   A contemptible young person, a lout, a person who behaves wildly.
3. 3
   A person who has isolated themselves from the outside world; one living an alternative lifestyle.
4. 4
   A furry character in art or literature which has the appearance of a regular animal (typically quadrupedal), that may or may not be able to communicate with humans or "anthros".
5. 5
   Misspelling of ferrule.