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Polemic is a noun. Don't confuse it with Polemical adjactive.
Instead of speaking reasonably, he turns everything into a polemic.
Polemic means an argument about a subject,especially against that subject. It frequently is angry, biased, and explosive.
"Adolf Hitler wrote his polemic "Mein Kampf" while in prison."
Harmony.
The candidate's polemic against his opponent was vicious and small-minded rather than well reasoned and convincing.