When trying to convey an idea effectively, using a powerful example can be incredibly impactful. However, sometimes using the same phrase repeatedly can become repetitive and dull. Luckily, there are plenty of synonyms that can be used to convey the same sentiment and intensity. One option is to use the phrase "compelling illustration" which implies both strength and persuasion. Another choice could be "potent instance," which suggests a clear and significant case. Additionally, "striking demonstration" highlights the visual and attention-grabbing nature of a well-constructed example. No matter which synonym is chosen, using a variety of phrasing can help to keep writing fresh and impactful.