Wiktionary
antitrinitarian
a. Rejecting the Trinitarian doctrine that God subsists as three distinct persons in the single substance of the Holy Trinity; nontrinitarian. n. One who rejects the Trinitarian doctrine.
Usage examples of "antitrinitarian".
Somewhat to the left of the Antitrinitarian sects were a few men, who had hardly any followers, who may be called, for want of a better term, Spiritual Reformers.
The Antitrinitarians were no more deists or free thinkers than were the Lutherans.