Nn: Nihilism

n.
1. Philosophy
a. An extreme form of skepticism that denies all existence.
b. A doctrine holding that all values are baseless and that nothing can be known or communicated.
2. Rejection of all distinctions in moral or religious value and a willingness to repudiate all previous theories of morality or religious belief.
3. The belief that destruction of existing political or social institutions is necessary for future improvement.
4. also Nihilism A diffuse, revolutionary movement of mid 19th-century Russia that scorned authority and tradition and believed in reason, materialism, and radical change in society and government through terrorism and assassination.
5. Psychiatry A delusion, experienced in some mental disorders, that the world or one's mind, body, or self does not exist.
[Latin nihil, nothing; see ne in Indo-European roots + -ism.]

But there was also about him an indescribable air which no mechanic could have acquired in the practice of his handicraft however dishonestly exercised: the air common to men who live on the vices, the follies, or the baser fears of mankind; the air of moral nihilism common to keepers of gambling hells and disorderly houses; to private detectives and inquiry agents; to drink sellers and, I should say, to the sellers of invigorating electric belts and to the inventors of patent medicines.
The Secret Agent by Conrad, Joseph