NET
18 They are darkened in their understanding, being alienated from the life of God because of the ignorance that is in them due to the hardness of their hearts.
Darby
18 being darkened in understanding, estranged from the life of God by reason of the ignorance which is in them, by reason of the hardness of their hearts,
KJV
18 Having the understanding darkened, being alienated from the life of God through the ignorance that is in them, because of the blindness of their heart: