disadvantage vs gainfulness

disadvantage

verb
  • To place at a disadvantage. 

noun
  • A setback or handicap. 

  • A weakness or undesirable characteristic; a con. 

  • Loss; detriment; hindrance. 

gainfulness

noun
  • The state or quality of being gainful; profitableness. 

How often have the words disadvantage and gainfulness occurred in a corpus of books? (source: Google Ngram Viewer )