waterproof

adjective

a warm waterproof jacket:

watertight, water-repellent, water-resistant, weatherproof;

damp-proof;

impermeable, impervious;

coated, proofed, rubberized, waxed.

▷antonyms leaky.

noun

British

she put on boots and a waterproof:

raincoat, anorak, mackintosh, sou'wester, oilskin, cagoule, cape;

British, informal mac.

waterproof Oxford Dictionary of English