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

 

good

 adverb
adverb
BrE BrE//ɡʊd//
 
; NAmE NAmE//ɡʊd//
 
 
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(especially North American English, informal) well ‘How's it going?’ ‘Pretty good.’ (non-standard) Now, you listen to me good! Word Origin Old English gōd, of Germanic origin; related to Dutch goed and German gut.
See the Oxford Advanced American Dictionary entry: good