'Weaker' in the Bible

Some time after this, Joseph was told, “Your father is weaker.” So he set out with his two sons, Manasseh and Ephraim.

The war between the house of Saul and the house of David was long and drawn out, with David growing stronger and the house of Saul becoming weaker.

But even more, those parts of the body that seem to be weaker are necessary.

Husbands, in the same way, live with your wives with an understanding of their weaker nature yet showing them honor as coheirs of the grace of life, so that your prayers will not be hindered.