'Weak' in the Bible

because his letters, he says, are weighty and strong, but his presence in the body weak, and his speech naught.

I speak as to dishonour, as though we had been weak; but wherein any one is daring, (I speak in folly,) I also am daring.

Who is weak, and I am not weak? Who is stumbled, and I burn not?

Wherefore I take pleasure in weaknesses, in insults, in necessities, in persecutions, in straits, for Christ: for when I am weak, then I am powerful.

Since ye seek a proof of Christ speaking in me, (who is not weak towards you, but is powerful among you,

for if indeed he has been crucified in weakness, yet he lives by God's power; for indeed we are weak in him, but we shall live with him by God's power towards you,)

For we rejoice when we may be weak and ye may be powerful. But this also we pray for, your perfecting.