Usage: 5 forms in 6 verses
Form Translated As     In Verse(s)
ενδιαβαλλόντων slandering LXX.Ps.109.20
ενδιαβάλλοντεσ slandering LXX.Ps.71.13
ενδιαβάλλοντέσ slandering LXX.Ps.109.29
ενδιαβάλλειν to stand in the way as an adversary against LXX.Num.22.22
ενδιέβαλλόν slandered LXX.Ps.38.20
they slandered LXX.Ps.109.4

Liddell-Scott-Jones

ἐνδιαβάλλω (endiaballō) to be adversary G:V

ἐνδιαβάλλω,

calumniate, [LXX+5th c.BC+]

__2 stand in the way as an adversary, [LXX]

LSJ Scripture Refs: LXX.Ps.108.4*LXX.Num.22.22