Like the sun; shining or dazzling with light, luster, or splendor; radiant; bright.Proceeding from the sun: as, sunny beams.Exposed to the rays of the sun; lighted up, brightened, or warmed by the direct rays of the sun: as, the sunny side of a hill or building.Figuratively, bright; cheerful; cheery: as, a sunny disposition.n. A familiar name of the common sunfish, or pumpkin-seed, Pomotis (Eupomotis) gibbosus, and related species. See cut under sunfish.