characterized by or given to extreme optimism, esp. in the face of unrelieved hardship or adversity.
Origin: 1825–35; after Pangloss, an optimistic character in Voltaire's Candide; cf. Gk panglossía garrulousness, wordiness (see pan-, glosso-, -y3); see -ian
"optimistic" (usually ironic or disparaging), 1831, from Fr. Panglosse, name of the philosopher and tutor in Voltaire's "Candide" (1758), from pan- (q.v.) + Gk. glossa, lit. "tongue" (see gloss).