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G3154 — ματαιόω

mataioō · to make futile · Greek

ματαιόω, -ῶ (μάταιος), [in LXX: 4Ki.17:15, Jer.2:5, al. הָבַל, etc. ;] to make vain, foolish: Rom.1:21.† (AS)

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1 tagged verse occurrence

Romans 1:21 · ἐματαιώθησανBecause that, when they knew God, they glorified [him] not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.