watertight
1. [ adjective ] not allowing water to pass in or out
Related terms: tight
2. [ adjective ] having no leaks
Synonyms: leakproof
Related terms: seaworthy
3. [ adjective ] without flaws or loopholes
Synonyms: unassailable unshakable bulletproof ironclad
Examples:

"an ironclad contract" "a watertight alibi" "a bulletproof argument"

Related terms: incontestable
Similar spelling:   watertown
  water_witch
  waterdog
  water_rat
  water_dog
  water_tap