Related Clues:
- Concentrated more than the others, being most stupid
- Most impenetrable part of warden's estate
- Most slow-witted
- Most populous
- Most thickheaded
- Most hare-brained guy meeting restrictions on entering street
- Most thick
- Like osmium among all the elements
- Like neutron stars, vis-a-vis everything else
- Most thickly populated
- Most packed