approval vs discontent

approval

noun
  • Something mailed by a seller to a collector to match their stated interests; the collector can approve of or return the item. 

  • An expression granting permission; an indication of agreement with a proposal; an acknowledgement that a person, thing, or event meets requirements. 

  • An expression of favorable acceptance and encouragement; a compliment that also condones. 

discontent

verb
  • To deprive of contentment; to make uneasy; to dissatisfy. 

adj
  • Not content; discontented; dissatisfied. 

noun
  • Dissatisfaction. 

  • A longing for better times or circumstances. 

  • A discontented person; a malcontent. 

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