KJV : Because <1360> that, when they knew <1097> (5631) God <2316>, they glorified <1392> (5656) [him] not <3756> as <5613> God <2316>, neither <2228> were thankful <2168> (5656); but <235> became vain <3154> (5681) in <1722> their <846> imaginations <1261>, and <2532> their <846> foolish <801> heart <2588> was darkened <4654> (5681).

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NASB : For even though they knew God, they did not honor Him as God or give thanks, but they became futile in their speculations, and their foolish heart was darkened.

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NASB# : For even though they knew<1097> God<2316>, they did not honor<1392> Him as God<2316> or<2228> give<2168> thanks<2168>, but they became<3154> futile<3154> in their speculations<1261>, and their foolish<801> heart<2588> was darkened<4654>.