Sunny1. (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).
Thesaurus Entries
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