Nihilism

Nihilism as a philosophical position is the view that the world, and especially human existence, is without meaning, purpose, comprehensible truth, or essential value. Some philosophers are considered nihilists if they hold the philosophical position that either (1) nothing exists (all there is is nothing), or (2) reality we humans experience does not exist at all as we see it. It is more often a charge leveled against a particular idea than a position to which someone is overtly subscribed.

In the world of ethics, nihilist or nihilistic is often used as a derogatory term referring to a complete rejection of all systems of authority, morality, and social custom, or one who purportedly makes such a rejection. Either through the rejection of previously accepted bases of belief or through extreme relativism or skepticism, the nihilist is construed as one who believes that none of these claims to power are valid. From a nihilist point of view, the ultimate source of moral values is the individual rather than culture or another rational foundation.

http://en.wikipedia.org/wiki/Nihilism