'Weaker' in the Bible

Now there was long war between the house of Saul and the house of David: and David grew stronger and stronger, but the house of Saul grew weaker and weaker.

No, much rather, those members of the body which seem to be weaker are necessary.

You husbands, in the same way, live with your wives according to knowledge, giving honor to the woman, as to the weaker vessel, as being also joint heirs of the grace of life; that your prayers may not be hindered.