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.

One who disregards laws and social norms as a form of rebellion against authority.

(by extension) One who promotes chaos and lawlessness; a nihilist.

One who resents outside control or influence on his or her life, in particular a government, and therefore desires the absence of political control.

(somewhat rare) Relating to anarchism or to anarchists, anarchistic.