Radical/ˈrædɪkl/ Definition 1 of 5Pro Tip 1/3Often Progressive The adjective form may imply progressive or modern thinking, beyond traditional norms. Her radical approach challenged the old-fashioned curriculum. Pro Tip 2/3Used for Emphasis Sometimes 'radical' amplifies the degree of change or difference being described. The artist's radical style broke from all conventions. Pro Tip 3/3Can Imply Risk Radical changes or ideas might carry a sense of risk due to their departure from the norm. They took a radical risk to update their business model.