| Waterproof 1. (a.) Proof against penetration or permeation by water; impervious to water; as, a waterproof garment; a waterproof roof. 2. (n.) A substance or preparation for rendering cloth, leather, etc., impervious to water. 3. (n.) Cloth made waterproof, or any article made of such cloth, or of other waterproof material, as rubber; esp., an outer garment made of such material. 4. (v. t.) To render impervious to water, as cloth, leather, etc. Thesaurus Entries airtight, bold, close, compact, dampproof, dripproof, dustproof, dusttight, fast, fireproof, firm, fit for sea, floodproof, gasproof, gastight, hermetic, hermetically sealed, insulate, leakproof, lightproof, lighttight, moistureproof, oilproof, oiltight, proof, rainproof, raintight, sea-kindly, sealed, seaworthy, seepproof, shut fast, smokeproof, smoketight, snug, soundproof, staunch, stiff, stormproof, stormtight, tender, tight, water-repellant, watertight, weatherly, weatherproof, windproof, windtight |