Definition from Wiktionary, the free dictionary
From Ancient Greek ἀνῠπόστᾰσῐς (anupóstasis, “unsubstantiality”), from ἀν- (an-, “not”) + ὑπόστᾰσῐς (hupóstasis, “substance”). Surface analysis: an- (“not”) + hypostasis (“the singular person of Christ”).
- (Can we clean up(+) this sense?) A theologoumenon maintaining that the logos' human nature - a general humanity - did not subsist apart from the divine nature.
- A theory characterizing Jesus as an eternal divine person with a related divine nature that "incarnates" via conjoining with an impersonal (anhypostasis) human nature (as opposed to a human person) and, therefore, necessarily denying that Jesus is a genuine man.