anarchist

Short definition from Wiktionary

Noun

1. 1
   One who believes in or advocates the absence of hierarchy and authority in most forms (compare anarchism), especially one who works toward the realization of such.
2. 2
   One who disregards laws and social norms as a form of rebellion against authority.
3. 3
   One who promotes chaos and lawlessness.
4. 4
   One who resents outside control or influence on their life, in particular a government, and therefore desires the absence of political control.

Adjective

1. 1
   Relating to anarchism or to anarchists; anarchistic.