1. To a considerable degree
   "he relied heavily on others' data";
   - to a great extent
    
2. In a heavy-footed manner
   "he walked heavily up the three flights to his room"
    
3. With great force
   "she hit her arm heavily against the wall"
    
4. Slowly as if burdened by much weight
   "time hung heavily on their hands";
   - heavy
    
5. In a manner designed for heavy duty
   "a heavily constructed car"; "heavily armed"
    
6. In a laboured manner
   "he breathed heavily"
    
7. Indulging excessively
   "he drank heavily";
   - intemperately, hard
    
8. Densely or thickly
   "The area was heavily forested"
    
9. With significant financial investment or loss
   "He invested heavily in tech stocks"

Encyclopedia: Heavily