In a manner relating to or characteristic of heresy or heterodox belief; in a way that deviates from established orthodoxy.
From heteric + -ally (adverb suffix converting adjectives to adverbs). The -ally suffix creates the adverbial form of heteric, describing how an action or statement relates to heterodoxy.
When medieval scholars wrote heterically, they weren't just disagreeing—they were committing intellectual rebellion that could end in execution, which is why so many heteric texts were hidden for centuries and only rediscovered by modern scholars looking through monastery archives.
Complete word intelligence in one call. Free tier — 50 lookups/day.