1. (n.) One who regards and keeps the seventh day of the week as holy, agreeably to the letter of the fourth commandment in the Decalogue.

2. (n.) A strict observer of the Sabbath.

3. (a.) of or pertaining to the Sabbath, or the tenets of Sabbatarians.

Albigensian Catharist Franciscan High-Churchist Trappist Waldensian abstainer abstinent anchorite anchoritic ascetic austere bhikshu bigoted creedbound dervish dogmatic eremitic evangelical fakir flagellant formalist formularist formulist fundamentalist hermit hidebound hyperorthodox literalist literalistic liturgist mendicant precisianist precisianistic purist puristic puritan puritanical rigoristic ritualist sacramentarian sannyasi self-denying staunch straitlaced strict wedded to poverty yogi yogin