Adjective : a cheerful person. ,cheerful surroundings. ,cheerful songs. ,cheerful giving.    From Dictionary.com. 

Recognize the risks, right and left, the risks brought by pastoral activities and interests, and those brought by pastoral loneliness and uncheerfulness.    From Wordnik.com.  [To My Younger Brethren Chapters on Pastoral Life and Work] Reference

Except -- that, no matter how cheerful and unsuspicious my disposition may be, when I go to the American Museum of Natural History, dark cynicisms arise the moment I come to the fossils -- or old bones that have been found upon this earth -- gigantic things -- that have been reconstructed into terrifying but "proper" dinosaurs -- but my uncheerfulness.    From Wordnik.com.  [The Book of the Damned] Reference

Brentford, and the furious resolution of the two Houses not to admit any treaty for peace, those indispositions, which had before touched him, grew into a perfect habit of uncheerfulness; and he, who had been so exactly unreserved and affable to all men, that his face and countenance was always present, and vacant, to his company, and held any cloudiness, and less pleasantness of the visage, a kind of rudeness or incivility, became, on a sudden, less communicable; and thence, very sad, pale, and exceedingly affected with the spleen.    From Wordnik.com.  [The Ontario Readers: The High School Reader, 1886] Reference