n. In metaphysics:n. The doctrine that this world is the worst possible.n. The doctrine that the development of the universe has such a law that it must ultimately reach, or at least tend toward, the same nonexistence from which it sprang.n. The tendency to exaggerate in thought the evils of life, or to look only upon its dark side; a melancholy or depressing spirit or view of life.n. The worst possible condition; the point of greatest deterioration.