Usage: 3 forms in 4 verses
Form Translated As     In Verse(s)
οδυνηράσ a grievous LXX.Jer.30.17
οδυνηράν a grievous LXX.1Kgs.2.8
οδυνηρά grievous LXX.Jer.14.17LXX.Lam.5.17

Liddell-Scott-Jones

ὀδυνηρός (odunēros) grievous G:A

ὀδυνηρός-ηρός,

Doric dialect ὀδυνηρός-ᾱρός, , όν, painful, ἕλκος [Refs 5th c.BC+]. adverb -ρῶς[Refs 4th c.BC+]: comparative -ότερον[Refs 1st c.AD+]

__2 distressing, γῆρας [Refs 6th c.BC+] O.; ὀδυνηρόν ἐστιν with infinitive, [Refs 4th c.BC+]