Usage: 3 forms in 7 verses
Form Translated As     In Verse(s)
σκυθρωπάσει shall look downcast LXX.Jer.19.8LXX.Jer.50.13
σκυθρωπάζων looking downcast LXX.Ps.35.14LXX.Ps.38.6LXX.Ps.42.9LXX.Ps.43.2
σκυθρωπάζει it looks downcast LXX.Prov.15.13

Liddell-Scott-Jones

σκυθρωπάζω (skuthrōpazō) to look downcast G:V

σκυθρωπάζω-άζω,

look angry or sullen, be of a sad countenance, [σκυθρωπάζωάζειν μόνον 4th c.BC: Amphis Comicus 13, compare 4th c.BC: Antiphanes Comicus 218.3, “PCair.Zen.” 481.30 (3rd c.BC)">Refs 5th c.BC+]: aorist 1, ἐσκυθρώπασαν ἀκούσαντες [σκυθρωπάζωάσας 4th c.BC: Aeschines Orator 2.36, compare 4th-3rd c.BC: Theophrastus Philosophus “Characteres” 14.7 ">Refs 5th c.BC+]: perfect σκυθρωπάζωακέναι [σκυθρωπάζωακώς 4th c.BC: Demosthenes Orator 45.68. ">Refs 5th c.BC+]

__2 to be of a sad colour, [Refs 2nd c.AD+]