fawning vs sincere

fawning

noun
  • Servile flattery. 

adj
  • Seeking favor by way of flattery; flattering, servile. 

sincere

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

  • Meant truly or earnestly. 

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