ἀρνέομαι, 
-οῦμαι; future 
ἀρνήσομαι; imperfect 
ὴρνούμην; 1 aorist 
ἠρνησάμην (rare in Attic, where generally 
ἠρνήθην cf. Matthew i. p. 538 [better Veitch under the word]); perfect 
ἤρνημαι; a deponent verb [(from Homer down)] signifying
1. to deny, 
i. e. εἰπεῖν... 
οὐκ [
to say... not, contradict]: 
Mark 14:70; 
Matthew 26:70; 
John 1:20; 
John 18:25, 
John 18:27; 
Luke 8:45; 
Acts 4:16; followed by 
ὅτι οὐ instead of simple 
ὅτι, in order to make the negation more strong and explicit: 
Matthew 26:72; 
1 John 2:22; (on the same use in Greek writings cf. Kühner ii. p. 761; [Jelf ii. 450; Winer's Grammer § 65, 2 
β.; Buttman 355 (305)]).
2. to deny, with an accusative of the person, in various senses:
a. ἀρν. 
Ἰησοῦν is used of follower of Jesus who, for fear of death or persecution, deny that Jesus is their master, and desert his cause, [
to disown]: 
Matthew 10:33; 
Luke 12:9; [
John 13:38 L text 
T Tr WH]; 2 Timothy 2:12, (
ἀρν. 
τὸ ὄνομα αὐτοῦ, 
Revelation 3:8 means the same); and on the other hand, of Jesus, denying that one is his follower: 
Matthew 10:33; 
2 Timothy 2:12.
b. ἀρν. God and Christ, is used of those who by cherishing and disseminating pernicious opinions and immorality are adjudged to have apostatized from God and Christ: 
1 John 2:22 (cf. 
1 John 4:2; 
2 John 1:7-11); 
Jude 1:4; 
2 Peter 2:1.
c. ἀρν. 
ἑαυτόν to deny himself, is used in two senses,
α. to disregard his own interests: 
Luke 9:23 [R WH marginal reading 
ἀπαρν.]; cf. 
ἀπαρνέομαι.
β. to prove false to himself, act entirely unlike himself: 
2 Timothy 2:13.
3. to deny i. e. abnegate, abjure; 
τί, to renounce a thing, forsake it: 
τὴν ἀσέβειαν κ. 
τὰς ἐπιθυμίας, 
Titus 2:12; by act to show estrangement from a thing: 
τὴν πίστιν, 
1 Timothy 5:8; 
Revelation 2:13; 
τὴν δύναμιν τῆς εὐσεβείας, 
2 Timothy 3:5.
4. not to accept, to reject, refuse, something offered: 
τινά, 
Acts 3:14; 
Acts 7:35; with an infinitive indicating the thing, 
Hebrews 11:24.
[Compare: 
ἀπαρνέομαι.] 
    THAYER’S GREEK LEXICON, Electronic Database.
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    BLB Scripture Index of Thayer's