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3154 GREEK
ματαιοω,
MATAIOO
mat-ah-yo'-o
from ματαιος, - mataios G 3152; to render (passively, become) foolish, i.e. (morally) wicked or (specially), idolatrous:--become vain.



εματαιωθησαν Rom 1:21 Because 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.
ματαιοι 1 Cor 3:20 And again, The Lord knoweth the thoughts of the wise, that they are vain. Titus 3:9 But avoid foolish questions, and genealogies, and contentions, and strivings about the law; for they are unprofitable and vain.

 

KING JAMES