nihilist Meaning, Definition & Usage

  1. noun someone who rejects all theories of morality or religious belief
  2. noun an advocate of anarchism
    syndicalist; anarchist.

WordNet

Ni"hil*ist noun
Etymology
Cf. F. nihiliste. See Nihilism.
Definitions
  1. One who advocates the doctrine of nihilism; one who believes or teaches that nothing can be known, or asserted to exist.
  2. (Politics) A member of a secret association (esp. in Russia), which is devoted to the destruction of the present political, religious, and social institutions.

Webster 1913