Definition of grossly adverb from the Oxford Advanced American Dictionary

 

grossly

 adverb
adverb
NAmE//ˈɡroʊsli//
 
(disapproving)
 
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(used to describe unpleasant qualities) extremely grossly overweight/unfair/inadequate Press reports have been grossly exaggerated.
See the Oxford Advanced Learner's Dictionary entry: grossly