Romans 1:28

And even as, &c. In this and the following verses the developements of sin are followed into less monstrous but more pervading and not less guilty forms.

as they did not like did not approve. The Gr. is akin to the Gr. of "reprobate" just below. Knowledge of God met with no approbation, and He gave them over to reprobation.

to retain God in their knowledge Lit. to have God in real (or full) knowledge. There was an antecedent knowledge of God; partly by the universe, partly by the constitution of their nature, partly by primeval revelation.

a reprobate mind Lit. a mind, or state of thought, rejected after test. The Gr. word, from this literal meaning, comes habitually to mean "refuse, outcast, abandoned."

convenient i.e. becoming. So Philemon 1:8, where the Greek word is nearly the same. The euphemism here is most forcible.