Definition of extremely adverb from the Oxford Advanced Learner's Dictionary

  

extremely

 adverb
adverb
BrE BrE//ɪkˈstriːmli//
 
; NAmE NAmE//ɪkˈstriːmli//
 
 
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(usually with adjectives and adverbs) to a very high degree extremely important/useful/complicated She found it extremely difficult to get a job. Their new CD is selling extremely well. I would be extremely grateful if you could have a word with her. The risks involved are extremely high. Mark knew he had behaved extremely badly. This issue is extremely complicated.
See the Oxford Advanced American Dictionary entry: extremely