sha.ga describes a person regarded as mad or acting mad, including a condition of being driven mad.

The occurrences describe people identified as mad or acting mad, including a person said to be driven mad; the supplied forms are participial in each verse.

1. Being regarded as mad · dominant

   The passive participles identify a person as mad in 2 Kings 9:11, Hosea 9:7, and Jeremiah 29:26; in Deuteronomy 28:34 the APB renders the clause, "You shall be driven mad from the sight of your eyes that you see." These verses apply the term to a named visitor, a prophet or man of the spirit, people who prophesy, and the person addressed in the warning.

   2 Kings 9:11Deuteronomy 28:34Hosea 9:7Jeremiah 29:26
2. Acting mad before another · rare

   In 1 Samuel 21:15, the Hithpael participle occurs in the question about someone brought "to act mad before me" and whether he should enter the speaker's house.

   1 Samuel 21:15

In the Anselm Project Bible: The APB uses "madman" or "mad" for the passive-participle occurrences and "to act mad" in 1 Samuel 21:15. These renderings show the verse-level presentation rather than a fixed English equivalent.