Antonyms of noun uncheerfulness
1 of 2 senses of uncheerfulness                                         
Sense 2
uncheerfulness -- (not conducive to cheer or good spirits)
       Antonym of cheerfulness (Sense 1)
      => cheerfulness, cheer, sunniness, sunshine -- (the quality of being cheerful and dispelling gloom; "flowers added a note of cheerfulness to the drab room")
Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun uncheerfulness
2 senses of uncheerfulness                                              
Sense 1
cheerlessness, uncheerfulness -- (a feeling of dreary or pessimistic sadness)
       => sadness, unhappiness -- (emotions experienced when not in a state of well-being)
Sense 2
uncheerfulness -- (not conducive to cheer or good spirits)
       => attribute -- (an abstraction belonging to or characteristic of an entity)

