Verse Comparison: Romans 1:21
American Standard Version
because that, knowing God, they glorified him not as God, neither gave thanks; but became vain in their reasonings, and their senseless heart was darkened.
Amplified® Bible
Because when they knew {and} recognized Him as God, they did not honor {and} glorify Him as God or give Him thanks. But instead they became futile {and} godless in their thinking [with vain imaginings, foolish reasoning, and stupid speculations] and their senseless minds were darkened.
Darby English Version
Because, knowing God, they glorified [him] not as God, neither were thankful; but fell into folly in their thoughts, and their heart without understanding was darkened:
International Standard Version
For although they knew God, they neither glorified him as God nor gave thanks to him. Instead, their thoughts turned to worthless things, and their ignorant hearts were darkened.
King James Version
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.
Young's Literal Translation
because, having known God they did not glorify `Him' as God, nor gave thanks, but were made vain in their reasonings, and their unintelligent heart was darkened,