lathamō

λανθάνω,
Refs 5th c.BC+:—also λήθω (which is the form of the active generally used in compounds, δια-λανθάνω being the sole exception), Refs 8th c.BC+; Doric dialect λάθω [ᾱ] Refs 5th c.BC+; infinitive
A λᾱθέμεν Refs 5th c.BC+: imperfect ἐλάνθανον Refs 8th c.BC+; Epic dialect λῆθον Refs 8th c.BC+; Ionic dialect λήθεσκεν Refs: future λήσω Refs 8th c.BC+; Aeolic dialect infinitive λᾱσην Refs 7th c.BC+; Doric dialect λᾱσῶ Refs 3rd c.BC+: aorist 1 ἔλησα Refs 8th c.BC+: aorist 2 ἔλᾰθον Refs 8th c.BC+: perfect λέληθα Refs 7th c.BC+; Aeolic dialect participle λελᾱθων Refs 7th c.BC+pluperfect ἐλελήθειν, Attic dialect -ήθη, Refs 5th c.BC+; Ionic dialect3rd.pers. singular ἐλελήθεε Refs 5th c.BC+
B causal ληθάνω, aorist 2 λέλᾰθον, see below Refs 5th c.BC+
C middle and passive, λανθάνομαι Refs 8th c.BC+; Doric dialect λάθομαι [ᾱ] Refs 5th c.BC+: Epic dialect imperfect λανθανόμην Refs 8th c.BC+: future λήσομαι Refs; Doric dialect λᾱσεῦμαι Refs 5th c.BC+aorist 1 ἐλησάμην or λησάμην only in late Epic dialect, Refs 3rd c.BC+ (Doric dialect λᾱς-), Refs 4th c.AD+; also ἐλήσθην, Doric dialect infinitive λασθῆμεν Refs 3rd c.BC+aorist 2 ἐλᾰθόμην, Epic dialect λαθ-, Refs 8th c.BC+: rare in Prose except in compounds, Refs 1st c.AD+; also Epic dialect reduplicate λελάθοντο, etc., see below c: perfect λέλησμαι Refs 5th c.BC+; Epic dialect λέλασμαι, participle λελασμένος, etc.; compare ἐπιλήθω.
A in most of the active tenses, escape notice (frequently joined with a negative):—Constr.:
A.1 with accusative person only, escape his notice, λάθε δ᾽ Ἕκτορα Refs 8th c.BC+; εἰ λανθάνει σε perhaps you don't know, Refs 4th c.BC+ it escaped the notice of the people, Refs 5th c.BC+; σὲ δὲ λέληθεν περὶ τοῦτο ὡς.. Refs 5th c.BC+
A.2 most frequently with a participle added, in which case we usually translate the participle by a Verb, and express λανθάνω by an adverb, unawares, without being observed; either,
A.2.a with accusative person, ἄλλον τινὰ λήθω μαρνάμενος I am unseen by others while fighting, i.e. Refsunseen by them, Refs 8th c.BC+ lest he come on unseen by me, Refs 5th c.BC+; ὅπως μὴ λήσουσιν αὐτοὺς αἱ νῆες.. ἀφορμηθεῖσαι should put to sea without their observing them, Refs 5th c.BC+; or,
A.2.b without an accusative, φονέα ἐλάνθανε βόσκων he maintained the murderer unawares, Refs 5th c.BC+: the reflexive pronoun may be supplied and is sometimes added, λέληθεν αὑτὸν τοῖς ξυνοῦσιν ὢν βαρύς Refs 8th c.BC+; μὴ διαφθαρεὶς λάθῃ [τινὰ ὁ βίος] Refs 5th c.BC+ —In a few examples this _construction_ is reversed, and λαθών is put in the participle, as in our idiom, ἀπὸ τείχεος ἆλτο λαθών (for ἔλαθεν ἁλόμενος) Refs 8th c.BC+
A.3 rarely with accusative et infinitive, μή σε λαθέτω ὑπερτιθέμεν let it not escape thee to.., i.e. forget not to.., Refs 5th c.BC+; σφᾶς λέληθε Θεόδωρον εἶναι it has been unnoticed that it was.., Refs 2nd c.AD+
A.4 followed by a relative clause, οὐδέ με λήθεις, ὅττι θεῶν τίς σ᾽ ἦγε thou escapest me not, it is not unknown to me, that some god led thee, Refs 8th c.BC+; ἐδόκεες θεοὺς λήσειν οἷα ἐμηχανῶ thou thought'st to escape the gods' notice in.., Refs 5th c.BC+; οὐ λανθάνεις με, ὅτι.. Refs 5th c.BC+; ὁ γείτων λ. τινὰ οὐ μόνον ὅτι πράττει, ἀλλ᾽ εἰ.. Refs 5th c.BC+
A.5 absolutely, escape notice or detection, Refs 5th c.BC+
B causal, make one forget a thing, with genitive of things, in compounds ἐκληθάνω, ἐπι-λήθ; the simple Verb only in Epic dialect reduplicate aorist 2, ὄφρα.. λελάθῃ ὀδυνάων that.. he may cause him to forget his pains, Refs 8th c.BC+
B.II in late Epic dialect, λέλαθον, ={ἔλαθον}, escaped notice of, ἑὸν νόον, τοκῆας, Refs 3rd c.BC+
C middle and passive, let a thing escape one, forget,
C.1 forget simply, in present (absolutely), σὺ δὲ λήθεαι Refs 8th c.BC+: mostly in aorist 2, ἀλκῆς λαθέσθαι Refs 8th c.BC+: also in reduplicate aorist, οὐδὲ σέθεν.. θεοὶ μάκαρες λελάθοντο Refs 8th c.BC+ that she might bear unknown): so in perfect, τῶν δὲ λέλασται Refs 8th c.BC+: with a relative clause, λελασμένος ὅσσ᾽ ἐπεπόνθει Refs 8th c.BC+: future middle in passive sense, once in Refs 5th c.BC+ never will be forgotten, El.1249 (Lyric poetry); compare ἐπιλανθάνω.
C.2 forget purposely, pass over, ἢ λάθετ᾽ ἢ οὐκ ἐνόησεν either he chose to forget it.., Refs 8th c.BC+
C.II in later writers future middle is used like active, escape notice, ἡμᾶς Refs 4th c.BC+

H. G. Liddell, R. Scott, H. S. Jones, A Greek-English Lexicon (9th ed., 1925–1940) — digitised by the Perseus Digital Library and corrected and expanded by Tyndale House, Cambridge, via STEPBible-Data's TFLSJ table, CC BY 4.0. Covers all of Greek literature, not just the Bible.