Definition of cheerfulness noun from the Oxford Advanced Learner's Dictionary

 

cheerfulness

 noun
noun
BrE BrE//ˈtʃɪəfəlnəs//
 
; NAmE NAmE//ˈtʃɪrfəlnəs//
 
[uncountable]
 
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behaviour that shows you are happy, especially in a difficult situation Everyone on the team demonstrated an unfailing cheerfulness that served us well.