Romans 1:21-23 simply because, although at one point experientially knowing God with insight, they did (or: do) not glorify (imagine; esteem; suppose; fancy; conjecture about; hold an opinion of; repute) Him as God, or even thank Him (or: give thanks in joyously expressing the goodness and well-being inherent in His grace and favor). And so in contrast, they were made futile (vain; fruitless; without profit; empty; useless; worthless; subject to a process of meaningless frustration; subject to exercises in futility) in their reasonings (or: thought processes; dialogues; ideas that went throughout in every direction), and their collective unintelligent (stupid; unable-to-put-things-together) heart was darkened (= the core of their being was made to experience an absence of light in a dim, shadowy gloom of obscurity = ignorance).

JMNT⁽ⁱ⁾ ²¹ simply because, although at one point experientially knowing God with insight, they did (or: do) not glorify (imagine; esteem; suppose; fancy; conjecture about; hold an opinion of; repute) [Him] as God, or even thank [Him] (or: give thanks in joyously expressing the goodness and well-being inherent in [His] grace and favor). And so in contrast, they were made futile (vain; fruitless; without profit; empty; useless; worthless; subject to a process of meaningless frustration; subject to exercises in futility) in their reasonings (or: thought processes; dialogues; ideas that went throughout in every direction), and their [collective] unintelligent (stupid; unable-to-put-things-together) heart was darkened (= the core of their being was made to experience an absence of light in a dim, shadowy gloom of obscurity [= ignorance]). ²² [So] continuously claiming (asserting; alleging with pretense) to be wise ones, they were made to be dull (sluggish; moronic; stupid; foolish) ²³ and they at once changed (or: exchange in barter; make other than it is) the glory (or: splendor and praise-inducing manifestation; or: esteem; opinion; imagination; supposition; thought; appearance; honorable consideration) of the imperishable (un-ruinable; unspoilable and incorruptible; non-decayable) God within the result of a likeness (resemblance; conformed similarity; copy-effect) of an image (form; appearance) of a perishable (corruptible; spoilable) human, as well as of flying things and of four-footed [animals] and of creeping things.