free-thinker (n.)youdaoicibaDictYouDict[free-thinker 词源字典]
"one not guided in belief by authority; one who submits the claims of authority to what he deems the test of reason," 1690s, from free (adj.) + think (v.) + agent noun suffix -er (1). Free-thought "rationalism" is from 1711. Related: Free-thinking.[free-thinker etymology, free-thinker origin, 英语词源]