schismatic /ʃɪzˈmæt.ɪk/adjective 3noun 1forms 1 adjective3 •Of or pertaining to a schism.The pontiff had made a last-ditch effort to persuade the society to halt the ordinations, calling them a “schismatic act” and a “sin of extreme gravity”. — 2026 •Divisive.schismatic opinions or proposals •Of or pertaining to a schisma. noun1 •A person involved in a schism.He semeth a sysmatyke Or els an heretike, For fayth in hym is faynte. — 1503 formsschismatics