derisive vs sincere

derisive

adj
  • Deserving or provoking derision or ridicule. 

  • Expressing or characterized by derision; mocking; ridiculing. 

noun
  • A derisive remark. 

sincere

adj
  • Genuine; meaning what one says or does; heartfelt. 

  • Meant truly or earnestly. 

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