Lexical Definition

‎ἀδικέω‎ adikéō (ad-ee-keh'-o) to harm ^G:V
from ‎ἄδικος‎

hurt, injure, be an offender, be unjust, (do, suffer, take) wrong.

• to be unjust, i.e. (actively) do wrong (morally, socially or physically)

Abbott-Smith

ἀδικέω, -ῶ (< ἄδικος), [in LXX for עשׁק, עוה, etc.;]
1. intrans., to be ἄδικος, do wrong, act wickedly or criminally: Ac 25:11, I Co 6:8, II Co 7:12, Col 3:25, Re 22:11; to do hurt, Re 9:19.
2. Trans.
(a) to do some wrong: ὃ ἠδίκησεν, Col 3:25; to wrong some one, Mt 20:13, Ac 7:26, 27 25:10, II Co 7:2, Ga 4:12, Phm 18, II Pe 2:13; pass., Ac 7:24, II Co 7:12; mid., I Co 6:7 (suffer . . . to be wronged; WM, §38, 3; but v. Bl., §54, 5; and cf. ἀποστερέω);
(b) to injure, hurt: Lk 10:19 Re 2:11 6:6 7:2, 3 9:4, 10 11:5.†

Abbott-Smith References

Liddell-Scott-Jones

ἀδικέω,

Aeolic dialect ἀδικήω [Refs 7th c.BC+], Doric dialect ἀδικίω [Refs]imperfect ἠδίκεον or ἠδίκευν[Refs 5th c.BC+]:—passive, future in middle form ἀδικήσομαι[Refs 5th c.BC+]: —to be ἄδικος, do wrong (defined by [Refs 4th c.BC+]those who have sinned, [Refs 5th c.BC+] and Attic dialect; τἀδικεῖν wrong-doing, [Refs 5th c.BC+]; τὸ μὴ ἀδικεῖν righteous dealing, [Refs 4th c.BC+]:— in legal phrase, do wrong in the eye of the law, the particular case being added in participle, as Σωκράτης ἀ... ποιῶν.. καὶ διδάσκων[Refs 5th c.BC+]; ἀ. πολλά, μεγάλα, etc., [Refs 5th c.BC+]; ἀ. εἰς πόλιν, κτῆμα, [Refs 4th c.AD+]:—in games or contests, play foul, [Refs 5th c.BC+]

__b in present, to be in the wrong, εἰ μὴ ἀδικῶ γε if I am not mistaken, [Refs 5th c.BC+]
__II transitive with accusative person, wrong, injure, [Refs 7th c.BC+]:— ruin, of a girl, [Refs 4th c.BC+]: with double accusative, wrong one in a thing, [Refs 5th c.BC+]:—passive, to be wronged, injured, μὴ δῆτ᾽ ἀδικηθῶ[Refs 5th c.BC+]; present ἀδικεῖται, -ούμενος used for the perfect ἠδίκηται, -ημένος (see.[Refs 5th c.BC+]: with accusative, to be defrauded of, μισθὸν ἀδικίας variant in [NT]
__II.2 harm, injure, ἀ. γῆν[Refs 5th c.BC+]

_{LSJ Scripture Refs: 2Pet.2.13}