above-board vs truthful

above-board

adj
  • In open sight; without trick, concealment, or deception. 

adv
  • Honestly; openly. 

truthful

adj
  • Accurately depicting what is real. 

  • Honest, and always telling the truth. 

How often have the words above-board and truthful occurred in a corpus of books? (source: Google Ngram Viewer )