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

 

earnestness

 noun
noun
BrE BrE//ˈɜːnɪstnəs//
 
; NAmE NAmE//ˈɜːrnɪstnəs//
 
[uncountable]
 
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the quality of being very serious and sincere I had always admired the intense earnestness of his character.