ἀμελετησία
From LSJ
ὀδοῦσι καὶ ὄνυξι καὶ πάσῃ μηχανῇ → tooth and nail | tooth, fang, and claw | in every possible way | by hook or by crook
English (LSJ)
ἡ,
A want of practice, negligence, Pl.Tht.153b; μνήμης Id.Phdr.275a, cf. Eus.Mynd.Fr.33, Ph.1.548, etc.
German (Pape)
[Seite 121] ἡ, Mangelan Uebung, Vernachlässigung, μνήμης Plat. Phaedr. 275 a u. Sp.