Synonyms of 'waterproof'
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Something that is impermeable will not allow fluid to pass through it.
The canoe is made from an impermeable wood.
Something that is watertight does not allow water to pass through it, for example because it is tightly sealed.
The batteries are enclosed in a watertight compartment.
Thesaurus for waterproof from the Collins English Thesaurus
Something which is waterproof does not let water pass through it.