watertight

adj

Etymology: From water + tight. Compare Scots wattirticht (“watertight”), West Frisian wetterticht (“waterproof”), Dutch waterdicht (“waterproof, watertight”), German wasserdicht (“watertight, waterproof”), Danish vandtæt (“watertight”), Swedish vattentät (“watertight, waterproof”).

1. So tightly made that water cannot enter or escape.

   “What a day, eh? Demmy, it's like the commencement of the rainy season in Bengal. But you'll find my carriage is watertight. Come along, my mother and Emmy are in the vestry.”

   “There is no reference to rough weather, and, indeed, the state of the vessel’s paint and rigging excludes the idea that she was abandoned for any such reason. She is perfectly watertight.”

2. So devised or planned as to be impossible to defeat, evade or nullify.

   “a watertight alibi”

   “a watertight contract”