'Weak' in the Bible

For while we were yet weak, in due season Christ died for the ungodly.

For what the law could not do, in that it was weak through the flesh, God, sending his own Son in the likeness of sinful flesh and for sin, condemned sin in the flesh:

But him that is weak in faith receive ye, yet not for decision of scruples.

One man hath faith to eat all things: but he that is weak eateth herbs.

Now we that are strong ought to bear the infirmities of the weak, and not to please ourselves.