1. (superl.) of or pertaining to the sun; proceeding from, or resembling the sun; hence, shining; bright; brilliant; radiant.

2. (superl.) Exposed to the rays of the sun; brightened or warmed by the direct rays of the sun; as, a sunny room; the sunny side of a hill.

3. (superl.) Cheerful; genial; as, a sunny disposition.

4. (n.) See Sunfish (b).

Leibnizian Saturnian aestival aglow balmy beaming beamy blithe blithesome blood-hot blood-warm blushing bright bright and sunny brilliant bubbly buoyant burning calid candescent cheerful cheery chiliastic chirk chirpy chirrupy clarion clear cloudless couleur de rose ebullient elated equatorial eupeptic euphoric exalted exhilarated fair fine flushed flushing friendly gay genial glad gladsome gleaming gleamy glinting glowing halcyon happy high hopeful illuminant in good spirits in high spirits incandescent irradiative irrepressible jolly joyful joyous lamping laughing light as day light-hearted lightsome luciferous lucific luciform luke lukewarm luminant luminative luminiferous luminificent luminous lustrous mild millenarian millennialistic mirthful of good cheer optimistic orient outgoing perfectibilitarian perfectionist pleasant radiant rainless riant room-temperature rose-colored roseate rosy rutilant rutilous sanguine sanguineous shining shiny smiling sparkling starbright starlike starry streaming subtropical suffused summery sunlit sunshiny temperate tepid thermal thermic toasty tropical unclouded undarkened unfrozen upbeat utopian warm warm as toast warmish winsome