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Heterodox vs Heretical 

Heterodox, heretical are comparable when they mean not in conformity with orthodox beliefs or teachings.

What is heterodox is at variance with accepted doctrines, especially of religion or science, or interpretations (as of the Bible or the Constitution), or with views regarded as authorized by reason, revelation, tradition, or convention.

What is heretical is not only heterodox but is regarded as not merely erroneous but destructive of truth.