acting with force or violence; violent.
extremely severe or extensive: a drastic tax-reduction measure.

1685–95; < Greek drastikós active, equivalent to drast(ós) (verbal adjective of drân to do) + -ikos -ic

drastically, adverb
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World English Dictionary
drastic (ˈdræstɪk)
extreme or forceful; severe
[C17: from Greek drastikos, from dran to do, act]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1690s, originally medical, "forceful, vigorous, especially in effect on bowels," from Gk. drastikos "effective," from drasteon "(thing) to be done," from dran "to do, act, perform." Sense of "extreme, severe" is first recorded 1808. Related: Drastically.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But, seriously, many of the colleges represented here are facing challenges
  that may require some major and even drastic changes.
If it is not, more drastic action will be required, which might make a big dent
  in economic growth.
But scientists agree that drastic measures will be needed to avert the ocean
  crises being created by climate change.
We are rapidly running out of time to control and avoid drastic climate change.
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