Nihilism is the belief that there can be no absolute answer or flawless, fundamental truth to any given system. e.g. It's basic principle is that it's not valid to say "God says that murder is wrong, so we can punish people for murder" because a nihilist would argue that God is not an infallible and fundamental truth - the system only works if you believe in God but if you don't then it becomes an invalid argument.
I consider myself quite the nihilist though I also understand that it doesn't exactly help when anxiety and depression are involved. Basically it leads to questioning and dismantling everything - every belief, thought construct, social value etc. Boundary dissolution at its best, I guess.
