| Noun | 1. | nihilism - a revolutionary doctrine that advocates destruction of the social system for its own sake | |
| 2. | nihilism - the delusion that things (or everything, including the self) do not exist; a sense that everything is unreal | |
| 3. | nihilism - complete denial of all established authority and institutionsanarchy, lawlessness - a state of lawlessness and disorder (usually resulting from a failure of government) | |