total rejection of established laws and institutions.

anarchy, terrorism, or other revolutionary activity.

total and absolute destructiveness, esp. toward the world at large and including oneself

the power-mad nihilism that marked Hitler's last years.

Philosophy .

an extreme form of skepticism

the denial of all real existence or the possibility of an objective basis for truth.

nothingness or nonexistence.

( sometimes initial capital letter ) the principles of a Russian revolutionary group, active in the latter half of the 19th century, holding that existing social and political institutions must be destroyed in order to clear the way for a new state of society and employing extreme measures, including terrorism and assassination.

annihilation of the self, or the individual consciousness, esp. as an aspect of mystical experience.