drastic

The story

1. Ancient Greekδρᾰ́ω (drắō)
2. Ancient Greekδρᾶσῐς (drâsĭs)
3. Ancient Greekδρᾱστῐκός (drāstĭkós)
4. English todaydrastic

From Ancient Greek δραστικός (drastikós, “active, efficient”), from δρᾶσις (drâsis, “strength, efficacy”), itself from δράω (dráō, “to do”).