'Flimsy' in the Bible

It is definitely because they have seduced My people, saying, ‘Peace,’ when there is no peace, and because when one builds a [flimsy] wall, behold, these [lying] prophets plaster it over with whitewash;

so tell those who plaster it with whitewash, that it will fall! A flooding rain [of judgment] will come, and you, O [great] hailstones, will fall; and a violent wind will tear the wall apart.