Water-tight

watertight

[waw-ter-tahyt, wot-er-]
adjective
1.
constructed or fitted so tightly as to be impervious to water: The ship had six watertight compartments.
2.
so devised or planned as to be impossible to defeat, evade, or nullify: a watertight contract; a watertight alibi.

Origin:
1350–1400; Middle English; see water, tight

watertightness, noun
nonwatertight, adjective
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World English Dictionary
watertight (ˈwɔːtəˌtaɪt)
 
adj
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
 
'watertightness
 
n

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