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
Scientists and engineers are trying to develop long-shot technologies that
  could drastically change the energy game.
Dams, irrigation and now climate change have drastically reduced the
  once-mighty river.
But there is a real possibility that the results will be drastically different.
But ecosystems are more drastically transformed by human activities.
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