When it comes to describing a brilliant idea, there are many great synonyms to choose from. Some popular options include "ingenious proposal," "remarkable brainstorm," or "outstanding concept." Other phrases that can be used include "insightful notion," "dazzling suggestion," or "stellar innovation." If you're looking for a more playful or whimsical way to describe a great idea, you might opt for "a stroke of genius," "an "Eureka moment," or "a lightbulb idea." Whatever phrase you choose, the key is to capture the essence of what makes an idea truly special - its creativity, uniqueness, and undeniable brilliance.