credulous vs quizzical

credulous

adj
  • Believed too readily. 

  • Excessively ready to believe things; gullible. 

quizzical

adj
  • Questioning or suggesting puzzlement. 

  • Strange or eccentric. 

  • Jocose; humorous. 

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