adj. 25B6; adjective
a sunny day : BRIGHT, sunshiny, sunlit, clear, fine, cloudless, without a cloud in the sky.
a sunny disposition : CHEERFUL, cheery, happy, light-hearted, bright, merry, joyful, bubbly, jolly, jovial, animated, buoyant, ebullient, upbeat, vivacious; poetic/literary blithe.
look on the sunny side : OPTIMISTIC, rosy, bright, hopeful, auspicious, favourable.
dull, miserable.