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From The Collaborative International Dictionary of English v.0.48:
Pessimism \Pes"si*mism\, n. [L. pessimus worst, superl. of pejor worse: cf. F. pessimisme. Cf. Impair.] 1. (Metaph.) The opinion or doctrine that everything in nature is ordered for or tends to the worst, or that the world is wholly evil; -- opposed to optimism. [1913 Webster] 2. A disposition to take the least hopeful view of a situation. [1913 Webster]