%dogmatist%

n. [ L. dogmatistes, Gr. &unr_; , fr. &unr_;. ] One who dogmatizes; one who speaks dogmatically; a bold and arrogant advancer of principles. [ 1913 Webster ]

I expect but little success of all this upon the dogmatist; his opinioned assurance is paramount to argument. Glanvill. [ 1913 Webster ]