watertight

(-tīt′)

adjective

  1. so snugly put together that no water can get in or through
  2. that cannot be misconstrued, refuted, defeated, nullified, etc.; flawless: a watertight excuse, plan, etc.

Related Forms:

See watertight in American Heritage Dictionary 4

adjective
  1. So tightly made that water cannot enter or escape.
  2. Having no flaws or loopholes; impossible to fault, refute, or evade: a watertight alibi; a watertight contract.

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