noun
a material or object that is leakproof
adjective
describing something that does not allow liquid or gas to escape
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The new water bottle is designed to be leakproof, ensuring no spills or messes.
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I love using my leakproof lunchbox because I never have to worry about my food leaking out.
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This tumbler is totally leakproof, so you can throw it in your bag without any worries.
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Her argument was leakproof, with no holes for anyone to poke through.