above-board vs guiltless

above-board

adj

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

adv

  • Honestly; openly. 

guiltless

adj

  • Without experience or trial; unacquainted (with). 

  • Free from guilt; innocent. 

  • Not encumbered with; free from. 

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