free-thinking vs progressive

free-thinking

adj
  • Having opinions that are contrary to dogma or the positions of authority. 

progressive

adj
  • Advancing in severity. 

  • Of or relating to progressive education. 

  • Favouring or promoting progress; advanced. 

  • Liberal. 

  • Continuous. 

  • Promoting or favoring progress towards improved conditions or new policies, ideas, or methods. 

  • Increasing in rate as the taxable amount increases. 

  • Gradually advancing in extent; increasing. 

noun
  • A progressive verb; a verb used in the progressive tense and (in English) generally conjugated to end in -ing. 

  • A person who actively favors or strives for progress towards improved conditions, as in society or government. 

How often have the words free-thinking and progressive occurred in a corpus of books? (source: Google Ngram Viewer )