Synonyms of free-thinking

2 Syllables
sinful, impious, heathen, pagan, faithless, godless
3 Syllables
agnostic, unholy, broad-minded, freethinking, blasphemous, undevout, atheistic
4 Syllables
undogmatic, irreverent, sacrilegious, unbelieving, irreligious
5 Syllables
iconoclastic