ἀνοπαῖα
From LSJ
δι' ἐρημίας πολεμίων πορευόμενος → he marched on without finding any enemy, his route lay through a country bare of enemies
English (LSJ)
only in Od.1.320 ὄρνις δ' ὣς ἀνοπαῖα διέπτατο, where it is variously written and explained: 1 acc. to Hdn.Gr.2.133, it is an Adv. (compd. of ἀνά, Οπτομαι), she flew away unseen, unnoticed; or, acc. to Eust., = ἄνω, ἀνωφερές, up into the air, cf. καρπαλίμως ἀνόπαιον Emp.51, and Ἀνόπαια, the name of the pass above Thermopylae (Hdt.7.216). 2 acc. to Aristarch., ἀνόπαια or πανόπαια, a kind of eagle, cf. Hebr. ᾰνᾱπηᾱ 'heron'. 3 acc. to Gramm. in An.Ox.1.83, ἀν' ὀπαῖα ( ἀνὰ ὀπήν) up by the hoie in the roof, up the smoke-vent.