watertight

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watertight in WordNet English dictionary

adjective

without flaws or loopholes
"an ironclad contract"; "a watertight alibi"; "a bulletproof argument"
unassailable unshakable watertight bulletproof
not allowing water to pass in or out
watertight

WordNet Lexical Database v3.0, © 2006 Princeton University

watertight in English Wiktionary

(adjective) So tightly made that water cannot enter or escape.

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