* Simple: The two political parties were antagonistic towards each other, constantly arguing and opposing each other's policies.
* With a specific subject: The doctor explained that the patient's immune system was antagonistic to the new medication, causing adverse reactions.
* Figurative: The artist's use of contrasting colors created an antagonistic relationship between the light and dark areas of the painting.
* More complex: The research team discovered a new compound that acted as an antagonist to the enzyme responsible for inflammation, potentially leading to new treatments.
Remember: "Antagonistic" usually refers to opposing forces, whether it's people, ideas, or even biological processes.