| compact(adjective, hard, tough, solid) |
| compressed(adjective, hard, tough, solid) |
| concentrated(verb, adjective, hard, tough) |
| concrete(adjective, hard, tough, solid) |
| condensed(verb, adjective, hard, tough) |
| consolidated(verb, adjective, solid, heavy) |
| crowded(adjective, solid, heavy, deep) |
| deep(adjective, solid, heavy, stiff) |
| gloppy(adjective, solid, heavy, deep) |
| gummous(adjective, solid, heavy, deep) |
| gunky(adjective, solid, heavy, deep) |
| hard(adjective, tough, firm, solid) |
| impenetrable(adjective, hard, tough, solid) |
| impervious(adjective, hard, tough, solid) |
| opaque(adjective, solid, heavy, deep) |
| turbid(adjective, solid, heavy, deep) |
| vitrified(adjective, solid, heavy, deep) |