The definition of an infidel is a person who you consider a heathen because he does not adhere to the religion you believe is the true religion.
A person who has very liberal views and, in religion, is tolerant of a wide variety of doctrines and forms of worship
A member of any of the ancient Greek philosophical schools that denied the possibility of any certain knowledge
One who believes that it is impossible to know whether there is a God.
Radical is someone who goes against social norms and who often advocates social change.
(Loosely, uncommon) A person who does not believe in a particular deity (any deity in a particular pantheon), notwithstanding that they may believe in another deity.
Alternative spelling of deist.
Find another word for freethinker. In this page you can discover 15 synonyms, antonyms, idiomatic expressions, and related words for freethinker, like: infidel, libertine, latitudinarian, skeptic, agnostic, radical, atheist, deist, ecumenicist, humanist and polemicist.