1. a person who holds extreme views or advocates radical measures
Usage: formal

Examples

• The ultraist demanded immediate and complete reform of the system.
• Political ultraists on both sides made compromise impossible.
• She was labeled an ultraist for her uncompromising stance on environmental policy.
• The party distanced itself from ultraist members who advocated violence.
• His ultraist views alienated many potential supporters.
• The debate was dominated by ultraists who refused to consider middle ground.