'Foolish' in the Bible

And every one that heareth these sayings of mine, and doeth them not, shall be likened unto a foolish man, which built his house upon the sand:

And five of them were wise, and five were foolish.

They that were foolish took their lamps, and took no oil with them:

And the foolish said unto the wise, Give us of your oil; for our lamps are gone out.