ἀνίσχυρος
From LSJ
δι' ἐρημίας πολεμίων πορευόμενος → he marched on without finding any enemy, his route lay through a country bare of enemies
English (LSJ)
ον,
A not strong, without strength, Str.2.1.36, v.l. in D.H.4.54, Sch.Theoc.14.15: Comp., ῥῖγος -ότερον Hp.Flat.8; invalid, of a document, ἄκυρος καὶ ἀ. PSI183.9 (V A.D.), Just.Nov.72.5.
