Answer: nihilist

AnswerCrossword Clue
NIHILIST"Think nothing of it" sayer?
NIHILISTUltimate nonbeliever
NIHILISTRussian adherent of anarchy.
NIHILISTAdvocate of violent revolution.
NIHILISTBeliever in mob rule
NIHILISTBeliever that life is meaningless
nihilisttotal rejection of established laws and institutions
nihilistbelief that existence has no meaning
nihilistas adherent of nihilism