| closed |
| heavy(adjective, hard, solid, rigid) |
| inaccessible(unaffected, unyielding, unbending, resistant, impervious) |
| pressure-tight(adjective, tight, proof, impervious, hermetic) |
| rainproof(adjective, resistant, impervious, watertight, waterproof) |
| solid(adjective, close, set, hard, tough) |
| substantial(adjective, close, set, hard, tough) |
| unpassable |
| air-tight(adjective, tight, proof, impervious, hermetic) |
| anesthetic |
| compacted(adjective, solid, dense, compressed) |
| compressed(adjective, set, hard, tough, firm) |
| concentrated(adjective, set, hard, tough, firm) |
| condensed(adjective, set, hard, tough, firm) |
| congested(adjective, close, solid, short, substantial) |
| consolidated(adjective, close, solid, short, substantial) |
| constipated(adjective, density) |
| crowded(adjective, close, solid, short, substantial) |
| imperforate |
| imporous(closure, density) |