| Drastic 1. (a.) Acting rapidly and violently; severe; radical; extreme; as, to take drastic measures. 2. (n.) A violent purgative. See Cathartic. Thesaurus Entries Draconian, acute, cutting, desperate, dire, excessive, exorbitant, extravagant, extreme, fierce, forceful, furious, great, harsh, immoderate, intemperate, intense, keen, outrageous, piercing, potent, powerful, puissant, radical, rigorous, rough, severe, sharp, splitting, strong, tough, unconscionable, vehement, venomous, vigorous, violent, virulent |