IPA: /ˈfriːˌθɪŋkər/
KK: /ˈfriːˌθɪŋkər/
A person who thinks independently and forms their own opinions, especially about religion and beliefs, rather than following traditional authority or dogma.
As a freethinker, she often questioned established beliefs and sought her own understanding of the world.
Freethinker → It is formed from "free" (from Old English "freo", meaning not in bondage or liberated) and "thinker" (from "think" which comes from Old English "þencan", meaning to conceive in the mind). A freethinker is someone who thinks freely, without the constraints of dogma or tradition.
Think of being 'liberated' ('free') in your thoughts, allowing you to 'conceive' ideas ('thinker') without restrictions.