Usage: 5 forms in 6 verses
Form Translated As     In Verse(s)
εξετηκόμην I wasted LXX.Ps.139.21
wasting away LXX.Ps.119.158
εξέτηξασ wastes away LXX.Ps.39.11
εξέτηξα I wasted not LXX.Job.31.16
εξέτηξέ wasted me away LXX.Ps.119.139
εκτήκουσαν wasting away LXX.Lev.26.16

Liddell-Scott-Jones

ἐκτήκω (ektēkō) to waste away G:V

ἐκτήκω,

future -ξω[Refs 5th c.BC+]:—melt out, Κύκλωπος ὄμματ᾽ . πυρί [Refs]; τὰ γράμματ᾽ . melt out the letters written on wax, [Refs 5th c.BC+]

__2 metaphorically, let melt, pine or waste away, ὄμμα δακρύοις [Refs 5th c.BC+]
__II passive, with perfect ἐκτέτηκα: aorist ἐξετάκην []:—melt and ooze out, [Refs 5th c.BC+]; τὸ ἐκτετηκός flabby condition, [Refs]
__II.2 metaphorically, pine, waste away, ἐκτέτηκα καρδίαν [Refs 5th c.BC+]; μάλα μοι τόδ᾽ ἐμμένοι καὶ μήποτ᾽ ἐκτακείη may it never melt from my remembrance, [Refs 5th c.BC+]