drastic (adj.)youdaoicibaDictYouDict[drastic 词源字典]
1690s, originally medical, "forceful, vigorous, especially in effect on bowels," from Greek drastikos "effective, efficacious; active, violent," from drasteon "(thing) to be done," from dran "to do, act, perform." Sense of "extreme, severe" is first recorded 1808. Related: Drastically.[drastic etymology, drastic origin, 英语词源]