Usage: 3 forms in 3 verses
Form Translated As     In Verse(s)
αστέγουσ homeless LXX.Isa.58.7
άστεγοσ open-mouthed LXX.Prov.10.8
άστεγον an open-mouthed LXX.Prov.26.28

Liddell-Scott-Jones

ἄστεγος (astegos) homeless G:A

ἄστεγος, ον,

(στέγη) without roof, houseless, [LXX+1st c.AD+]; unprotected, exposed, [Refs 1st c.AD+]

__II (στέγω) active, not holding: metaphorically, . χείλεσι unable to keep one's mouth shut, given to prating, [LXX]

LSJ Scripture Refs: LXX.Isa.58.7LXX.Prov.10.8