Pronunciation: (sun'ē),[key] —adj.,-ni•er, -ni•est. 1. abounding in sunshine: a sunny day. 2. exposed to, lighted, or warmed by the direct rays of the sun: a sunny room. 3. pertaining to or proceeding from the sun; solar.
4. resembling the sun.
5. cheery, cheerful, or joyous: a sunny disposition.