λανθάνω
Etym. from Root ΛΑΘ
A. in most of the act. tenses, "to escape notice, to be unknown, unseen, unnoticed":
1. c. acc. pers., λ. τινά only, "to escape" his notice, Lat. latere aliquem, Hom., attic; impers., σὲ λέληθε it "has escaped" your notice, Plat.
2. most often with a part. added, in which case we usually translate the part. by a Verb, and express λανθάνω by an Adverb, "unawares, without being observed, unseen, unknown"; and this, either,
a. with an acc. pers., ἄλλον τινὰ λήθω μαρνάμενος "I am unseen by" others while fighting, i. e. I fight "unseen by" them, Il.; μὴ λάθηι με προσπεσών lest he come on "unseen" by me, Soph.
b. without an acc., μὴ διαφθαρεὶς λάθηι lest he perish "without himself knowing it", id=Soph.; δουλεύων λέληθας you are a slave "without knowing it", Ar.—This construct. is reversed, as in our idiom, ἀπὸ τείχεος ἆλτο λαθών (for ἔλαθεν ἁλόμενος) Il.; λήθουσά μ᾽ ἐξέπινες Soph.
B. the compd. Verbs ἐκληθάνω, ἐπιλήθω (v. sub vocc.), take a Causal sense, "to make one forget" a thing, c. gen. rei: so in redupl. aor2 λέλαθον, ὄφρα λελάθηι ὀδυνάων that "he may cause" him "to forget" his pains, Il.
C. Mid. and Pass. "to let" a thing "escape one, to forget":
1. "to forget", absol. or c. gen. rei, Hom.; so in redupl. aor., οὐδέ σέθεν θεοὶ λελάθοντο Il., etc.; and in perf. pass., ἐμεῖο λελασμένος id=Il.; κείνου λελῆσθαι Soph.
2. "to forget purposely, to pass over", ἢ λάθετ᾽ ἢ οὐκ ἐνόησεν either "he chose to forget it" or perceived it not, Il.