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