Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
ατειχίστοισ unwalled LXX.Num.13.19
ατείχιστοσ unwalled LXX.Prov.25.28

Liddell-Scott-Jones

ἀτείχιστος (ateichistos) unwalled G:A

ἀτείχιστος, ον,

unwalled, unfortified, [Refs 5th c.BC+]. adverb -τως[LXX+2nd c.AD+]; . τετειχισμένοι, of Brahmans living in the open air, [Refs 2nd c.AD+]

__2 not walled off, [Refs 5th c.BC+]

LSJ Scripture Refs: LXX.Zech.2.4*