Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
τερπνότητεσ Delightfulness LXX.Ps.16.11
τερπνότητα delightfulness LXX.Ps.27.4

Liddell-Scott-Jones

τερπνότης (terpnotēs) delightfulness G:N-F

τερπνότης, ητος, ,

pleasantness, delight, [LXX+2nd c.AD+]

LSJ Scripture Refs: LXX.Ps.15.11*