Definition of quick adverb from the Oxford Advanced American Dictionary

     

    quick

     adverb
    adverb
    NAmE//kwɪk//
     
    (quicker, quickest)
     
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  1. 1quickly; fast Come as quick as you can! Let's see who can get there quickest. It's another of his schemes to get rich quick.
  2. 2quick- (in adjectives) doing the thing mentioned quickly quick-thinking quick-growing
  3. Which Word?quick / quickly / fast Quickly is the usual adverb from quick:I quickly realized that I was on the wrong train. My heart started to beat more quickly. Quick is sometimes used as an adverb in very informal language, especially as an exclamation:Come on! Quick! They’ll see us!Quicker is used more often:My heart started to beat much quicker. The quicker I get you away from here, the better. Fast is more often used when you are talking about the speed that someone or something moves at:How fast can a cheetah run? Can’t you drive any faster? You’re driving too quickly.There is no word fastly.Idioms
    (as) quick as a flash/wink
     
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    very quickly Quick as a wink she was at his side.
See the Oxford Advanced Learner's Dictionary entry: quick