If “heterodox” is a new word for you, you’re likely familiar with its counterpart: “orthodox.” The Greek root “doxa” means “opinion,” and “heteros” means “other,” so to describe someone or something as “heterodox” means it’s outside of the accepted norm or against commonly held opinions. Synonyms for “heterodox” include “dissenting,” “nonconforming,” “freethinking,” “iconoclastic,” “rebellious,” “renegade,” and “skeptical.”