1794 "worst condition possible," borrowed (by Coleridge) from Fr.
pessimisme, formed (on model of Fr.
optimisme) from L.
pessimus "worst," originally "bottom-most," from PIE
*ped-samo-, superl. of base
*pes- "foot" (see
foot). As a name given to the doctrines of Schopenhauer, Hartmann, etc., that this is the worst possible world, or that everything tends toward evil, it is first recorded 1878, from Ger.
pessimismus (Schopenhauer, 1819).
Pessimist "one who habitually expects the worst" is first recorded 1836, from Fr.
pessimiste; pessimistic formed in Eng. 1868.