Resistant to the effects of water. / Made of or covered with material that doesn't allow water in. / (figuratively) Incapable of failing; unassailable.

To make waterproof or water-resistant.

A substance or preparation for rendering cloth, leather, etc., impervious to water.

present participle of waterproof

The treatment of something to make it waterproof. / A waterproof material.

Having been made waterproof

simple past tense and past participle of waterproof

The property of being waterproof.

Third-person singular simple present indicative form of waterproof

plural of waterproof.