【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.

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