C2 noun /ˈfriːˌθɪŋkər/
freethinker
свободомыслящий человек
Meaning
A person who forms opinions based on reason and independent thought rather than tradition or authority.
Example
Voltaire was considered a great freethinker of his time.
Вольтер был признан великим свободомыслящим человеком своего времени.