above-board vs unquestionably

above-board

adv
  • Honestly; openly. 

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

unquestionably

adv
  • without question; beyond doubt; indubitably. 

  • OK, right-on 

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