ἀρνησίχριστος

From LSJ

ξένος ὢν ἀκολούθει τοῖς ἐπιχωρίοις νόμοις → as a foreigner, follow the laws of that country | when in Rome, do as the Romans do

Source

Greek (Liddell-Scott)

ἀρνησίχριστος: -ον, ὁ τὸν Χριστὸν ἀρνούμενος, Θεόδ. Στουδ. σ. 412Α.

Spanish (DGE)

-ου, ὁ renegado de Cristo Basil.Ep.210.5.46.