- (figuratively) Incapable of failing; unassailable.
- Made of or covered with material that doesn't allow water in.
- Unaffected by water.
- Cloth made waterproof, or any article made of such cloth, or of other waterproof material, as rubber; especially, an outer garment made of such material.
- A substance or preparation for rendering cloth, leather, etc., impervious to water.
- To make waterproof or water-resistant.