'Weaker' in the Bible

But if the animals were weaker, he did not set the branches there. So the weaker animals ended up belonging to Laban and the stronger animals to Jacob.

However, the war was prolonged between the house of Saul and the house of David. David was becoming steadily stronger, while the house of Saul was becoming increasingly weaker.

On the contrary, those members that seem to be weaker are essential,

Husbands, in the same way, treat your wives with consideration as the weaker partners and show them honor as fellow heirs of the grace of life. In this way nothing will hinder your prayers.