nihilism

n. general rejection of customary beliefs (in religion, morality, etc.); skepticism; nothingness

Nihilism (from the Latin nihil, nothing) is a philosophical position, sometimes called an anti-philosophy, which argues that the world, especially past and current human existence, is without objective meaning, purpose, comprehensible truth, or essential value. Nihilists generally assert some or all of the following:there is no reasonable proof of the existence of a higher ruler or creator,a "true morality" does not exist, andsecular ethics are impossible;
See more at Wikipedia.org...

Nihilism /ni·hil·ism/ 1. an attitude of skepticism regarding traditional values and beliefs or their frank rejection. 2. [more]Nihilism - Community and Resources

Noun
1. a revolutionary doctrine that advocates destruction of the social system for its own sake
(hypernym) doctrine, philosophy, philosophical system, school of thought, ism
2. the delusion that things (or everything, including the self) do not exist; a sense that everything is unreal
(synonym) nihilistic delusion
(hypernym) delusion, psychotic belief
3. complete denial of all established authority and institutions
(hypernym) anarchy, lawlessness

(n.)
The theories and practices of the Nihilists.
  

(n.)
The doctrine that nothing can be known; scepticism as to all knowledge and all reality.
  

(n.)
Nothingness; nihility.