barbarian

Short definition from Wiktionary

Adjective

1. 1
   Relating to people, countries, or customs perceived as uncivilized or inferior.

Noun

1. 1
   A non-Greek or a non-Roman citizen.
2. 2
   An uncivilized or uncultured person, originally compared to the hellenistic Greco-Roman civilisation; usually associated with senseless violence and self-harm or other such shows of brute force and lack of mental faculty.
3. 3
   A person destitute of culture; a Philistine.
4. 4
   Someone from a developing country or backward culture.
5. 5
   A brutish warrior depicted in sword and sorcery and other fantasy works; typically clad in primitive furs or leather and usually favoring physical strength over intelligence while often possessing a bellicose temperament and disdain for laws.
6. 6
   A cruel, savage, inhumane, brutal, violently aggressive person, particularly one who is unintelligent or dim-witted; one without pity or empathy.
7. 7
   A foreigner, especially with barbaric qualities as in the above definitions.