1: ἀσέβεια
(Strong's #763 — Noun Feminine — asebeia — as-eb'-i-ah )

"impiety, ungodliness," is used of (a) general impiety, Romans 1:18; 11:26; 2—Timothy 2:16; Titus 2:12; (b) "ungodly" deeds, Jude 1:15 , RV, "works of ungodliness;" (c) of lusts or desires after evil things, Jude 1:18 . It is the opposite of eusebeia, "godliness."

A — 1: ἀσεβής
(Strong's #765 — Adjective — asebes — as-eb-ace' )

"impious, ungodly" (akin to A), "without reverence for God," not merely irreligious, but acting in contravention of God's demands, Romans 4:5; 5:6; 1—Timothy 1:9; 1—Peter 4:18; 2—Peter 2:5 (ver. 6 in some mss.); 3:7; Jude 1:4,15 (twice).

B — 1: ἀσεβέω
(Strong's #764 — Verb — asebeo — as-eb-eh'-o )

akin to A and B, signifies (a) "to be or live ungodly," 2—Peter 2:6; (b) "to commit ungodly deeds," Jude 1:15 .