Quick Definition
ἄθεος, ον Adj godless
Strong's Definition
from 1 (as a negative particle) and 2316; godless
KJV Usage: without God
UBS Dictionary of the Greek New Testament
adjc. | -ον | ἀ- + θεός
12.2 · Supernatural Beings and Powers · Supernatural Beings
being without God pertaining to being without any relationship to God
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Mounce Concise Greek Dictionary
ἄθεος atheos 1x
an atheist; godless, estranged from the knowledge and worship of the true God, Eph. 2:12*
Abbott-Smith Greek Lexicon
* ἄ-θεος, -ον, in cl. slighting or denying the gods (Plat.; cf. MM, VGT, s.v.);
godless, ungodly (Pind.);
abandoned by the gods (Soph.)
In the NT (cf. Lft. on Ign. ad Trail, §3), of the heathen, without God, not knowing God (Cremer, 281): Eph 2:12.†
Moulton & Milligan — Vocabulary of the Greek NT
ἄθεος. OGIS 569% (iv/A.D.) τῆς τῶν ἀθέων ἀπεχθοῦς ἐπιτηδεύσεως. For the popular cry αἶρε τοὺς ἀθέους, “Ανναν with the atheists,” directed against the early Christians, see the account of the martyrdom of Polycarp in Eus. #.£. iv. 15, 19: cf. 75. ix. 10, 12, map’ ᾧ ye (Maximinus) μικρῷ πρόσθεν δυσσεβεῖς ἐδοκοῦμεν kal ἄθεοι καὶ παντὸς ὄλεθροι τοῦ βίου. See also the Logion P Oxy I. 1 γεείοῦ ἐὰν ὦσιν [β΄ οὐκ] ε[ἰσὶ]ν ἄθεοι.
Liddell-Scott-Jones — Greek-English Lexicon
ἄθεος (atheos) — without God. ἄθεος, ον,
__B without vision, τινός[Refs 3rd c.AD+] (assuming variant; ἀθέ[ατ]ος Volkmann). __B.2 unseen, [Refs 2nd c.AD+]