G3154 ματαιόω (mataióō)

KJV renderings: become vain
Strong's definition: to render (passively, become) foolish, i.e. (morally) wicked or (specially), idolatrous
Derivation: from G3152 (μάταιος);

From James Strong's public-domain dictionaries (G), JSON edition by OpenScriptures (CC-BY-SA). Every dotted-underline word in the text links here.