Usage: 3 forms in 6 verses
Form Translated As     In Verse(s)
χέρσου uncultivated land LXX.Isa.7.25
χέρσοσ an uncultivated land LXX.Isa.7.24
χέρσον an uncultivated LXX.Hos.10.4LXX.Hos.12.11
an uncultivated land LXX.Isa.5.6
they shall be uncultivated LXX.Isa.7.23

Liddell-Scott-Jones

χέρσος (chersos) uncultivated G:N-F

χέρσος,

later Attic dialect χέρρος, , dry land, opposed to water, ἐπὶ χέρσου, opposed to ἐν πόντῳ, [Refs 8th c.BC+]; χέρσῳ on or by land, [Refs 5th c.BC+]; πάνδοκον εἰς ἀφανῆ τε χ., of the realm of Hades, [Refs 8th c.BC+] the gender cannot be determined, feminine [Refs 5th c.BC+] on barren soils, [Refs 4th c.BC+]

__II after [Refs 8th c.BC+] as adjective, χέρσος, ον, dry, firm, of land, [Refs 5th c.BC+]; Εὐρώπαν ποτὶ χέρσον to the mainland of Europe, [Refs 5th c.BC+]
__II.2 dry, hard, barren, τῆς χώρης ἐούσης χ. [Refs 5th c.BC+]; παραδοῦναι [τὴν γῆν] χέρρον, i.e. ψιλήν, without a crop on it, [LXX]waste places, [Refs 4th c.BC+]; χ. λιμήν a harbour left dry, [Refs 2nd c.BC+]
__II.3 metaphorically, barren, of women, χέρσους φθαρῆναι κἀγάμους [Refs 5th c.BC+]
__II.3.b with genitive, barren of, πυρὰ χέρσος ἀγλαϊς μάτων [Refs 5th c.BC+]. (Cf. Sanskrit hár[snull]ate 'become stiff, bristle', Avest. zarštva- 'stone', Latin horreo.)

LSJ Scripture Refs: LXX.Isa.7.24