Liddell-Scott-Jones

ἄκαυστος (akaustos) inextinguishable ^G:A

ἄκαυστος-ος, ον,

(καίω) unburnt, [Refs 5th c.BC+]

__2 incombustible, [Refs 4th c.BC+]; unquenchable (variant for{ἄσβεστος}), πῦρ[LXX]

_{LSJ Scripture Refs: LXX.Job.20.26}