ἀσθενέω, 
-ῶ; imperfect 
ἠσθένουν; perfect 
ἠσθένηκα (
2 Corinthians 11:21 L T Tr WH); 1 aorist 
ἠσθένησα; (
ἀσθενής); [from Euripides down]; 
to be weak, feeble; universally, to be without strength, powerless: 
Romans 8:3; rhetorically, of one who purposely abstains from the use of his strength, 
2 Corinthians 13:4; and of one who has no occasion to prove his strength, 
2 Corinthians 13:9; contextually, to be unable to wield and hold sway over others, 
2 Corinthians 11:21; by oxymoron, 
ὅταν ἀσθενῶ, 
τότε δυνατός εἰμι when I am weak in human strength, then 
am I strong in strength divine, 
2 Corinthians 12:10; 
εἴς τινα, to be weak towards one, 
2 Corinthians 13:3; with a dative of the respect added: 
πίστει, to be weak in faith, 
Romans 4:19; 
πίστει, to be doubtful about things lawful and unlawful to a Christian, 
Romans 14:1; simple 
ἀσθενεῖν with the same idea suggested, 
Romans 14:2, 
21 [T WH omit; Tr marginal reading brackets]; 
1 Corinthians 8:9 Rec., 11f; 
τίς ἀσθενεῖ, 
καὶ οὐκ ἀσθενῶ; who is weak (in his feelings and conviction about things lawful), and I am not filled with a compassionate sense of the same weakness? 
2 Corinthians 11:29. contextually, 
to be weak in means, needy, poor: 
Acts 20:35 (so [Aristophanes pax 636]; Euripides, in Stobaeus, 145 vol. 2:168, Gaisf. edition), cf. DeWette [more fully Hackett, per contra Meyer] at the passage. Specially of debility in health: with 
νόσοις added, 
Luke 4:40; simply, 
to be feeble, sick: 
Luke 7:10 [R G Tr marginal reading brackets]; 
Matthew 25:36, 
39 L text 
T Tr WH; John 4:46; 
John 11:1-3, 
6; 
Acts 9:37; 
Philippians 2:26; 
2 Timothy 4:20; 
James 5:14; 
οἱ ἀσθενοῦντες, and 
ἀσθενοῦντες, 
the sick, sick folks: 
Matthew 10:8; 
Mark 6:56; 
Luke 9:2 Rec.; 
John 5:3, 
7, 
13 Tdf.; 
John 6:2; 
Acts 19:12. 
    THAYER’S GREEK LEXICON, Electronic Database.
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    BLB Scripture Index of Thayer's