Lexical Definition

‎ἐπιλανθάνομαι‎ epilanthánomai (ep-ee-lan-than'-om-ahee) to forget ^G:V
middle voice from ‎ἐπί‎ and ‎λανθάνω‎

(be) forget(-ful of).

• to lose out of mind
• by implication, to neglect

Abbott-Smith

ἐπι-λανθάνομαι (alternative mid, form of ἐπιλήθω, to cause to forget) [in LXX chiefly for שָׁכַח ;]
to forget, neglect: c. inf., Mt 16:5, Mk 8:14; c. gen., He 6:10 13:2, 16; c. acc (as occasionally in cl.; MM, Exp., xiv), Phl 3:13; ὁποῖος ἦν, Ja 1:24; pass. ptcp. (cf. Is 23:16, Si 3:14 23:14, Wi 2:4), Lk 12:6.†

Abbott-Smith References

Liddell-Scott-Jones

Included with: ἐπιλανθάνω-ω,

cause to forget, ὁ γάρ τ᾽ [ὕπνος] ἐπέλησεν ἁπάντων laps one in forgetfulness of all, [Refs]; ἡδονὴ σφέας ἐπιλανθάνωουσα τῶν πάρος 2nd c.AD: Aretaeus Medicus “χρονίων νούσων θεραπευτικόν” 2.12; ἐπιλήσει σε ἀφροδισίων 2nd-3rd c.AD: Philostratus Sophista “Epistulae” 68:—passive, to be forgotten, in perfect participle ἐπιλελησμένος Vetus Testamentum Graece redditum LXX.Isa.23.16 [NT]: future -λησθήσομαι Vetus Testamentum Graece redditum “Wisdom of Solomon” 2.4.

__II. middle, ἐπιλανθάνομαι, or more commonly ἐπιλανθάνωομαι, Aeolic dialect and Doric dialect -λᾱθ- [Refs]future -λήσομαι: aorist 2 -ελᾰθόμην 5th-6th c.BC: Plato Philosophus “Apologia” 17a: late aorist 1 -ελήσατο Nonnus Epicus 4th-5th c.AD(?) “Dionysiaca” 48.969: with perfect active λέληθα 5th c.BC: Herodotus Historicus 3.46 [Refs], but more frequently passive -λέλησμαι [Refs 5th c.BC+]: piperfect -ελελήσμην [Refs]:—let a thing escape one, forget, lose thought of, c.genitive, ὅπως Ἰθάκης ἐπιλήσεται (Epic dialect aorist subjunctive) [Refs]; οὐδ᾽ ὁ γέρων δολίης ἐπελήθετο τέχνης 4.455 [Refs]; οὐδ᾽ ὣς σχεδίης ἐπελήθετο 8th c.BC: Odyssea Homerus Epicus “Odyssey” 5.324; γονέων ἐπιλάθεται (Doric dialect) [Refs 5th c.BC+]: c.infinitive, [Refs]participle, ὀφείλων ἐπιλέλᾱθα I forgot that I owed, [Refs 5th c.BC+]; περὶ οὗ.., περὶ ὅτου.., [Refs]; leave disregarded, neglect, πρόσταγμα 1st c.AD: Cebes Philosophus 24.
__II.2. less frequently, forget wilfully, τῶν ἐντολέων μεμνημένος ἐπελανθάνετο 5th c.BC: Herodotus Historicus 3.147; ἑκὼν ἐπιλανθάνωομαι [Refs]

_{LSJ Scripture Refs: LXX.Isa.23.16 ☩ Luke.12.6}