Gross in medical terminology means able to see with the unaided eye, as in without a microscope, and negative means that they didn't find anything. So if something is grossly … negative, then they looked at it and nothing looked abnormal to them.5 people found this useful.f something is grossly intact. … It means it deviates very little from the norm. So basically from a viewing a doctor thought your mind processed information in a normal way.