above-board vs disinterested

above-board

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

adv
  • Honestly; openly. 

disinterested

adj
  • Uninterested, lacking interest. 

  • Having no stake or interest in the outcome, and no conflicts of interest; free of bias, impartial. 

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