[waw-ter-tahyt, wot-er-]
constructed or fitted so tightly as to be impervious to water: The ship had six watertight compartments.
so devised or planned as to be impossible to defeat, evade, or nullify: a watertight contract; a watertight alibi.

1350–1400; Middle English; see water, tight

watertightness, noun
nonwatertight, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
watertight (ˈwɔːtəˌtaɪt)
1.  not permitting the passage of water either in or out: a watertight boat
2.  without loopholes: a watertight argument
3.  kept separate from other subjects or influences: different disciplines are often thought of in watertight compartments

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Usually the best time to reach a legally watertight genocide determination has
  been in a courtroom after the crime has occurred.
Unlike any other known protein formation, the structures resemble watertight
  zippers running perpendicular to the fibril itself.
The ship, though crippled, remained watertight except for the damaged area.
The hull was subdivided into eleven watertight compartments and had a double
  bottom extending the entire length of the ship.
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