heretic

This term carries a heavy historical weight, evoking images of religious persecution and the strict enforcement of orthodoxy. While it originates in a theological context, it is frequently used today to describe a rebel or a visionary who challenges the status quo in secular fields like science, art, or politics.

Because the word implies a conflict between an individual and a powerful institution, it often suggests a sense of courage or stubbornness. Depending on the perspective of the speaker, calling someone a heretic can be either a condemnation of their betrayal or a compliment to their intellectual independence.