The verb is used of unfounded assertion, Act 24:9; Act 25:19; Rev 2:2.
Wise, they became fools
Another oxymoron; see on Rom 1:20. Compare Horace, insaniens sapientia raving wisdom. Plato uses the phrase μάταιον δοξοσοφίαν vain-glorying of wisdom (“Sophist,” 231).