'Weaker' in the Bible

Now there was a long war between the house of Saul and the house of David; and David grew steadily stronger, but the house of Saul grew weaker continually.

On the contrary, it is much truer that the members of the body which seem to be weaker are necessary;

You husbands in the same way, live with your wives in an understanding way, as with someone weaker, since she is a woman; and show her honor as a fellow heir of the grace of life, so that your prayers will not be hindered.