H6949 קָהָה קָהָה (qâhâh), Strong’s H6949: to be dull KJV: be set on edge, be blunt.. Occurs 4 times. Source: https://besorah.bible/word/H6949 — Besorah, the whole Bible in Hebrew, Greek and English. Texts and licences: https://besorah.bible/about/credits.html qâhâh — to be dull KJV: be set on edge, be blunt. Occurs 4 times. Brown–Driver–Briggs - [קָהָה] vb. be blunt, dull - Qal (all of teeth) - Pi. in sense of Qal: if the iron be blunt. Where it occurs - Jeremiah 31:29 (https://besorah.bible/tanakh/jeremiah/31?v=29) — “In those days they will say no more, “‘The fathers have eaten sour grapes, and the children’s teeth are set on edge.’ - Jeremiah 31:30 (https://besorah.bible/tanakh/jeremiah/31?v=30) — But everyone will die for his own iniquity. Every man who eats the sour grapes, his teeth will be set on edge. - Ezekiel 18:2 (https://besorah.bible/tanakh/ezekiel/18?v=2) — “What do you mean, that you use this proverb concerning Eretz-Israel, saying, ‘The fathers have eaten sour grapes, and… - Ecclesiastes 10:10 (https://besorah.bible/tanakh/ecclesiastes/10?v=10) — If the ax is blunt, and one doesn’t sharpen the edge, then he must use more strength; but skill brings success.