Lexical Definition

‎παχύνω‎ pachýnō (pakh-oo'-no) to thicken G:V
from a derivative of ‎πήγνυμι‎ (meaning thick)

wax gross.

Usage: 5 forms in 8 verses
Form Translated As     In Verse(s)
ἐπαχύνθη Has grown dull Matt.13.15Acts.28.27
παχυνθή shall thicken LXX.Eccl.12.5
επαχύνθησαν They became fat LXX.Jer.5.28
επαχύνθη he was thickened LXX.Deut.32.15
thickened LXX.Isa.34.6
was thickened LXX.Isa.6.10
επάχυνεν thickened LXX.2Sam.22.12

Abbott-Smith

παχύνω (< παχύς, thick), [in LXX: De 32:15, Is 6:10 (שָׁמֵן), al.;]
to thicken, fatten; pass., to grow fat. Metaph., to make dull or stupid (τ. ψυχάς, Plut.); pass., to wax gross: ἡ καρδία, Mt 13:15, Ac 28:27 (LXX).†

Abbott-Smith References

Book Refs
Deuteronomy 32:15
Isaiah 6:10
Matthew 13:15
Acts 28:27

Liddell-Scott-Jones

παχύνω-ω,

perfect passive πεπάχυσμαι [Refs 4th c.BC+]:—fatten, τὰ σώματα [Refs 5th c.BC+]:—passive, grow fat, [LXX+5th c.BC+]

__b thicken, strengthen, δεσμόν [Refs 3rd c.AD+]
__2 metaphorically, cause to wax fat, increase, κότον π. [Refs 4th c.BC+]:—passive, ὄλβος ἄγαν παχυνθείς [Refs]
__2.b metaphorically, make gross or dull, τὰς ψυχὰς ὑπὸ πλης μονῆς π. [Refs 1st c.AD+]; βρώσεις τὸν νοῦν π. [Refs 2nd c.AD+]“V A” 1.8:— passive, [LXX+2nd c.AD+]; to be coarsened, [ψυχὴ] παρὰ τὴν ἰδίαν φύσιν πεπαχυμμένη [Refs 2nd c.AD+]in R.1.119 K.
__II passive, become thick, π. πρὸς τὸν ἥλιον, of the skull, [Refs 5th c.BC+]; of humours, [Refs 5th c.BC+]; of excrements, [Refs 4th c.BC+]; distinguished from πήγνυσθαι, [Refs]; of fruit juices, become concentrated, [Refs 4th c.BC+]; of oil, [Refs 2nd c.AD+]
__II.2 to be dulled, of the sun's light, [Refs 2nd c.AD+]

LSJ Scripture Refs: LXX.Eccl.12.5LXX.Isa.6.10