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

 

truthfulness

 noun
noun
BrE BrE//ˈtruːθflnəs//
 
; NAmE NAmE//ˈtruːθflnəs//
 
[uncountable]
 
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the quality of only saying what is true synonym honesty I have no reason to doubt the truthfulness of his statement.