'Cheerfulness' definitions:

Definition of 'cheerfulness'

From: WordNet
noun
The quality of being cheerful and dispelling gloom; "flowers added a note of cheerfulness to the drab room" [syn: cheerfulness, cheer, sunniness, sunshine] [ant: uncheerfulness]
noun
A feeling of spontaneous good spirits; "his cheerfulness made everyone feel better" [syn: cheerfulness, blitheness] [ant: cheerlessness, uncheerfulness]

Definition of 'Cheerfulness'

From: GCIDE
  • Cheerfulness \Cheer"ful*ness\, n. Good spirits; a state of moderate joy or gayety; alacrity. [1913 Webster]

Synonyms of 'cheerfulness'

From: Moby Thesaurus