Radical

basic essential primary vital original natural inherent constitutional foundational underlying primitive innate organic profound cardinal deep-seated native intrinsic basal meat-and-potatoes bottom thoroughgoing

excessive complete entire violent severe revolutionary rebellious militant fanatical insubordinate lawless anarchistic nihilistic mutinous insurgent riotous seditious recalcitrant intransigent uncompromising refractory recusant restive ultra ultraist extremist insurrectionary progressive advanced sweeping thorough iconoclastic freethinking far-out way out rabid immoderate leftist