truth-telling vs untruthful

truth-telling

noun

  • The act of telling the truth. 

adj

  • Telling the truth; honest, frank. 

untruthful

adj

  • Pertaining to falsehood; corrupt; dishonest. 

  • Not giving the truth; providing untrue facts; lying. 

How often have the words truth-telling and untruthful occurred in a corpus of books? (source: Google Ngram Viewer )