Watertight vs. Waterproof

So tightly made that water cannot enter or escape.

(figurative) So devised or planned as to be impossible to defeat, evade or nullify.

Example: ‘a watertight contract; a watertight regulation’;

having no leaks

not allowing water to pass in or out

without flaws or loopholes;

Example: ‘an ironclad contract’; ‘a watertight alibi’; ‘a bulletproof argument’;

Unaffected by water.

Made of or covered with material that doesn't allow water in.

(figurative) Incapable of failing; unassailable.

To make waterproof or water-resistant.

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

Proof against penetration or permeation by water; impervious to water; as, a waterproof garment; a waterproof roof.

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

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.

To render impervious to water, as cloth, leather, etc.

any fabric impervious to water

a water-resistant coat

make watertight;

Example: ‘Waterproof the coat’;

not permitting the passage of water