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I'm not the OP, but my attempt through breaking down word etymologies would be something like:

ortho: rigid, straight, correct

doct: teachings, learnings

ic: of, or pertaining to

So orthodoctic seems to have the meaning of "pertaining to rigid or correct teachings".

Hm I improvised an adjective for orthodoxy. Maybe it's orthodoxic .. I hope you get the meaning now.

The adjective form of orthodoxy is orthodox. Think of something like the "Orthodox" church. And it's antonym is "unorthodox", for example: "the unorthodox church" ;)

And what's the term for adding redundant adjective suffix to an adjective ? :)

I’ve heard of the word “orthorexia”