| sealed(adjective, tight, proof, closed, impervious) |
| impervious(adjective, solid, fast, short, dense) |
| tight(adjective, proof, impervious, sealed, airtight) |
| airtight(adjective, tight, proof, closed, impervious) |
| watertight(adjective, tight, proof, impervious, airtight) |
| hermetical(adjective, tight, proof, impervious) |
| impermeable(adjective, tight, proof, impervious, impenetrable) |
| waterproof(adjective, tight, proof, impervious, airtight) |
| recondite(adjective, obscure, dark, deep, mysterious) |
| snug |
| air-tight(adjective, tight, proof, impervious) |
| deep(adjective, obscure, complex, thoughtful, meaning) |
| shut(adjective, closed, airtight) |
| airproof(adjective, tight, proof, impervious) |
| closed(adjective, closed) |
| esoteric(adjective, obscure, dark, deep, mysterious) |
| hidden(adjective, close, quiet, obscure, solid) |
| impenetrable(adjective, fast, short, dense, unaffected) |
| profound(adjective, obscure, complex, deep, thoughtful) |
| dampproof(adjective, tight, proof, impervious) |