Leibnizian optimism, Pollyannaism, blitheness, blithesomeness, bright outlook, bright side, brightness, buoyancy, cheer, cheerful expectation, cheerfulness, cheeriness, cheery vein, eupeptic mien, geniality, gladness, gladsomeness, good cheer, happiness, hope, hopefulness, idealism, millennialism, optimisticalness, perfectibilism, perfectionism, philosophical optimism, pleasantness, positivism, radiance, rosy expectation, rosy outlook, sanguine expectation, sanguine humor, sanguineness, sanguinity, silver lining, sunniness, utopianism, winsomeness