| hermetic(verb, adjective, tight, proof, closed) |
| sealed(adjective, tight, proof, impervious, hermetic) |
| tight(adjective, proof, impervious, hermetic, sealed) |
| watertight(adjective, tight, proof, impervious, hermetic) |
| air-tight(adjective, tight, proof, impervious, hermetic) |
| closed(verb, adjective, closed, enclosed, sealed) |
| impermeable(adjective, tight, proof, impervious, impenetrable) |
| impervious(adjective, fast, short, tight, dense) |
| unassailable(adjective, certain, indisputable) |
| waterproof(adjective, water, tight, proof, impervious) |
| gas-tight(adjective, tight, proof, impervious, hermetic) |
| irrefutable(adjective, certain, indisputable) |
| airproof(adjective, tight, proof, impervious, hermetic) |
| hermetical(adjective, tight, proof, impervious, hermetic) |
| impenetrable(adjective, sealed) |
| incontrovertible |
| snug |
| certain(adjective, strong, sound, indisputable) |
| dampproof(adjective, tight, proof, impervious, hermetic) |
| fast |