BDB2174
הוֺלֵלוּת noun feminine id. (formed unusually from the participle, an Aramaic formation, compare BaNB 414 f.) תְּהִּלַּת דִּבְּרֵיפִֿיהוּ סִכְלוּת וְאַחֲרִית פִּיהוּ הוֺלֵלוּת רָעָה Eccl 10:13 the beginning of the words of his mouth is folly, and the end of his mouth (his speech) is evil madness.
הַלֲלוּיָהּ, הַלֲלוּיָהֿ see הלל Pi`el