Easton's Bible Dictionary (1897)
The waste, probably some high waste land to the south of the Dead Sea (Num. 21:20; 23:28; 1 Sam. 23:19, 24); or rather not a proper name at all, but simply “the waste” or “wilderness,” the district on which the plateau of Ziph (q.v.) looks down.
Smith's Bible Dictionary (1863)
(a wilderness), a name which occurs in (Numbers 21:20) and Numb 23:28 In designating the position of Pisgah and Peor; both described as “facing the Jeshimon.” Perhaps the dreary, barren waste of hills lying immediately on the west of the Dead Sea.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
JESH'IMON (the waste),- a name designating the position of Pisgah and Peor, which are described as "looketh toward Jeshimon." Num 21:20 Num 23:28. The word may not be a proper name, but a general term for any wilderness, and may thus be applied to different places at different times. Grove would place Jeshimon on the west side of the Dead Sea, toward En-gedi; Porter suggests that there may have been two Jeshimons, one east of the Jordan connected
with Pisgah, and another west of the Jordan; Conder, with Grove, proposes to identify Jeshimon with the plateau above the Dead Sea, on its west side, and called el Bukein', the most desolate country in Palestine.
Hitchcock's Bible Names (1869)
solitude; desolation