above-board vs frightful

above-board

adv
  • Honestly; openly. 

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

frightful

adv
  • Frightfully; very. 

adj
  • Unpleasant, dreadful, awful (also used as an intensifier). 

  • Genuinely horrific, awful, or alarming. 

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