above-board vs decidedly

above-board

adv
  • Honestly; openly. 

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

decidedly

adv
  • In a manner which leaves little question; definitely, clearly. 

  • In a decided or final manner; resolutely. 

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