Definition of drastic adjective from the Oxford Advanced American Dictionary

 

drastic

 adjective
adjective
NAmE//ˈdræstɪk//
 
 
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extreme in a way that has a sudden, serious, or violent effect on something drastic measures/changes The government is threatening to take drastic action. a drastic shortage of food a drastic reduction in their standard of living Talk to me before you do anything drastic.
drastically
 
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NAmE//ˈdræstɪkli//
 
adverb Output has been drastically reduced. Things have started to go drastically wrong.
See the Oxford Advanced Learner's Dictionary entry: drastic