above-board vs trifling

above-board

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

adv
  • Honestly; openly. 

trifling

adj
  • Of suspicious character, typically secretive or deceitful; shady. 

  • Trivial, or of little importance. 

  • Idle or frivolous. 

noun
  • The act of one who trifles; frivolous behaviour. 

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