above-board vs mightly

above-board

adv
  • Honestly; openly. 

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

mightly

adv
  • Very. 

  • Mightily. 

adj
  • Mighty; competent; capable; strong; powerful. 

  • Substantial; weighty; of import. 

  • Able; able to occur; possible. 

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