Professing, &c. = saying that they were. Greek. phasko. See Acts 24:9.
became fools. Literally were fooled (i.e. by their perverted mind). Greek. moraino. Here, Matthew 5:13.Luke 14:34; 1 Corinthians 1:20.
Related Commentaries of Romans 1:22
Romans 1:22
22 Professing themselves to be wise, they became fools,