A primary verb; to leave, i.e. (intransitively or passively) to fail or be absent -- be destitute (wanting), lack.
1. transitive, to leave, leave behind, forsake; passive to be left behind (properly, by one's rival in a race, hence), a. to lag, be inferior: ἐν μηδενί, James 1:4 (Herodotus 7, 8, 1); (others associate this example with the two under b.).
b. to be destitute of, to lack: with the genitive of the thing, James 1:5; James 2:15 (Sophocles, Plato, others).
2. intransitive, to be lacking or absent, to fail: λείπει τί τίνι, Luke 18:22; Titus 3:13 (Polybius 10, 18, 8; others); τά λείποντα, the things that remain (so Justin Martyr, Apology 1, 52, cf. 32; but others are lacking), Titus 1:5. (Compare: ἀπολείπω, διαλείπω, ἐκλείπω, ἐπιλείπω, καταλείπω, ἐνκαταλείπω, περιλείπω, ὑπολείπω.)