Strong's Concordance G3154

Original Word: ματαιόω

Transliteration: mataióō

Phonetic Spelling: mat-ah-yo'-o

[ματαιόω] from G3152; to render (passively, become) foolish, i.e. (morally) wicked or (specially), idolatrous

Usages throughout the bible

Romans 1:21 - Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain ^G3154 in their imaginations, and their foolish heart was darkened.