G3154 ματαιόω

mataióō — to render (passively, become) foolish, i.e. (morally) wicked or (specially), idolatrous

KJV: become vain

Occurs 7 times. Every verse with this word

Where it occurs

Romans 1:21 — Because knowing God, they didn’t glorify him as God, and didn’t give thanks, but became vain in their reasoning, and…
Judith 6:4 — For with them we will burn them up. Their mountains will be drunken with their blood. Their plains will be filled with…

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