1. The quality of being cheerful and dispelling gloom
   "flowers added a note of cheerfulness to the drab room";
   - cheer, sunniness, sunshine
    
2. A feeling of spontaneous good spirits
   "his cheerfulness made everyone feel better";
   - blitheness

See also: cheerful, cheerless, depressing, uncheerful

Type of: attribute, happiness

Part of: disposition, temperament

Encyclopedia: Cheerfulness