Quick Definition
I forget entirely
Strong's Definition
to be utterly oblivious of
Derivation: middle voice from G1537 (ἐκ) and G2990 (λανθάνω);
KJV Usage: forget
Thayer's Greek Lexicon
ἐκλανθάνω: to cause to forget; middle, to forget; perfect ἐκλέλησμαι, followed by the genitive: Heb_12:5. (Homer and following.)
Mounce Concise Greek Dictionary
ἐκλανθάνομαι eklanthanomai 1x
to make to forget; to forget entirely, Heb_12:5
Abbott-Smith Greek Lexicon
** ἐκ -λανθάνω ,
[in Sm .: Psa_13:2 * ;]
to escape notice utterly; mid ., to forget utterly: Heb_12:5 .†
Moulton & Milligan — Vocabulary of the Greek NT
ἐκλανθάνω (~ ἐκλανθάνομαι ) [page 195]
P Oxy IX. 1203 .8 (late i/A.D.) ἐγλαθόμενος τῆς ἐξακολ [ο ]υθούσης αὐτῷ εὐθύνης , heedless of the reckoning that would follow (Ed.).
STEPBible — Tyndale Abridged Greek Lexicon
ἐκ-λανθάνω
[in Sm.: Psa.13:2 * ;]
to escape notice utterly; mid., to forget utterly: Heb.12:5.†
(AS)