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Adjective: watertight  'wo-tu(r),tIt
  1. Not allowing water to pass in or out
     
  2. Without flaws or loopholes
    "a watertight alibi";
    - unassailable, unshakable, bulletproof, ironclad, unshakeable

See also: incontestable, incontestible, tight

Encyclopedia: Watertight