Adjective watertight has 3 senses
  1. leakproof, watertight - having no leaks
    Antonym: unseaworthy (indirect, via seaworthy)
  2. watertight - not allowing water to pass in or out
    Antonym:
    leaky (indirect, via tight)
  3. ironclad, unassailable, unshakable, watertight, bulletproof - without flaws or loopholes; "an ironclad contract"; "a watertight alibi"; "a bulletproof argument"
    Antonym: contestable (indirect, via incontestable)
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