disadvantage vs unsadness

disadvantage

noun
  • A weakness or undesirable characteristic; a con. 

  • A setback or handicap. 

  • Loss; detriment; hindrance. 

verb
  • To place at a disadvantage. 

unsadness

noun
  • infirmity, unsteadiness, weakness 

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