(n.) The quality of being sanguine; sanguineness.

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