Usage: 5 forms in 21 verses
Form Translated As     In Verse(s)
ακουστόν an audible LXX.Isa.18.3
audible LXX.Gen.45.2LXX.Ps.143.8LXX.Isa.23.5LXX.Isa.62.11LXX.Jer.46.14LXX.Jer.50.2
audibly LXX.Isa.48.3LXX.Isa.48.5LXX.Isa.48.20
ακουστήν audible LXX.Deut.4.36LXX.2Kgs.7.6LXX.Isa.30.30
audibly LXX.Isa.52.7
ακουστή audible LXX.Exod.28.35
ακουστάσ Audibly LXX.Ps.106.2
ακουστά audible LXX.Judg.13.23LXX.Jer.50.2
audibly LXX.Isa.45.21LXX.Isa.48.6LXX.Jer.31.7

Liddell-Scott-Jones

ἀκουστός (akoustos) audible G:A

ἀκουστός-στός, , όν,

heard, audible, [Refs 5th c.BC+]; opposed to θεατός, [Refs 5th c.BC+]

__II that should be heard, with negative, δεινόν, οὐκ .[Refs 5th c.BC+]