watertight (adj.)
- airtight
- bold
- bombproof
- bulletproof
- burglarproof
- close
- compact
- fast
- fire-resisting
- fireproof
- firm
- flameproof
- foolproof
- hermetic
- leakproof
- lightproof
- proof
- rainproof
- resistant
- rustproof
- sealed
- seaworthy
- shatterproof
- shellproof
- snug
- soundproof
- staunch
- stiff
- stormproof
- tender
- tight
- waterproof
- weatherly
- weatherproof
