weakness, infirmity
The word ἀσθένεια sits at the intersection of physical frailty and moral limitation. Its literal core is 'without strength,' a compound of the alpha-privative (negation) and sthenos, meaning bodily power or vigor. So the word does not simply describe someone who is tired. It describes someone whose capacity has reached its floor. There is nothing left to draw from.
But the New Testament authors stretch this word in surprising directions. Luke uses it for the woman bent double for eighteen years (Luke 13:11), a physical condition that made her unable to straighten herself. Paul uses it for his own preaching condition in Corinth, arriving 'in weakness' (1 Corinthians 2:3), meaning he came without rhetorical polish or impressive presence. John uses it for Lazarus, whose illness sets the stage for resurrection glory (John 11:4).
What ties these uses together is the idea of a condition that exposes human limits. When ἀσθένεια appears, something a person cannot fix by trying harder is in view. The body fails. The words don't come. The courage isn't there. The resources are gone.
Paul makes his most stunning move with the word in 2 Corinthians 12, where he says he will boast in his weaknesses because God's power is perfected precisely there. The word doesn't change its meaning. The condition is still real, still limiting, still painful. What changes is the theological frame around it. Weakness becomes the address where grace shows up.
Most of us read 'weakness' and immediately try to move past it. We treat it like a problem to solve or a phase to exit. I spent years reading Paul's boasts about weakness as motivational language, a kind of grit-and-grace speech, rather than a sober theology of human limitation.
But ἀσθένεια is not motivational. It's confessional. Paul isn't telling you to embrace weakness so you can feel better. He's telling you that the places in your life where your capacity genuinely runs out are not accidents. They are the coordinates where God does his clearest work. Your chronic illness, your failing marriage, your inability to stop sinning the same sin, your exhausted ministry. These are not disqualifiers. They are the very locations where the power of Christ descends to rest.
From the Greek alpha-privative prefix (a-) meaning 'not' or 'without,' combined with sthenos, meaning 'strength' or 'bodily power.' The verb form is astheneo, meaning 'to be weak' or 'to be sick.' The adjective form is asthenes, meaning 'powerless' or 'feeble.' This same root feeds into the English medical prefix 'a-sthenia,' as in myasthenia gravis. Related ideas appear in the Hebrew dal and chalash, both signifying feebleness or frailty.
Where astheneia appears in Scripture, and why each verse showcases it.
But he said to me, 'My grace is sufficient for you, for my power is made perfect in weakness.' Therefore I will boast all the more gladly of my weaknesses, so that the power of Christ may rest upon me.
This verse is the theological summit of the word. Paul doesn't pray his weakness away; he turns it into a platform, because ἀσθένεια is the precise condition in which divine power becomes visible.
Likewise the Spirit helps us in our weakness. For we do not know what to pray for as we ought, but the Spirit himself intercedes for us with groanings too deep for words.
Here ἀσθένεια describes the believer's inability to pray rightly, a spiritual limitation the Spirit himself steps into and fills.
For we do not have a high priest who is unable to sympathize with our weaknesses, but one who in every respect has been tempted as we are, yet without sin.
The plural 'weaknesses' here draws ἀσθένεια into Christology directly. Jesus is not distant from your condition; he took on this same category of human limitation.
And I was with you in weakness and in fear and much trembling.
Paul's description of his arrival in Corinth uses ἀσθένεια not as an apology but as a context, the frail container that made God's power in his preaching unmistakably divine in origin.
But when Jesus heard it he said, 'This illness does not lead to death. It is for the glory of God, so that the Son of God may be glorified through it.'
The word for 'illness' here is asthenia in the underlying text, and Jesus immediately reframes it. The weakness is real, Lazarus will die, but its ultimate trajectory is glory.
Words in the same semantic family.
Every video where Adam teaches on this word, in publication order.
