above-board vs seriously

above-board

adv
  • Honestly; openly. 

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

seriously

adv
  • In a serious or literal manner. 

  • Used to attempt to introduce a serious point in a less serious conversation. 

  • In an extreme or major way; majorly 

  • Used to call back to a previous point, in disbelief or for emphasis. 

  • Gravely; deeply; very much. 

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