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.

A plant of the species Citrullus lanatus, bearing a melon-like fruit.

A flow of water over the edge of a cliff. / (figuratively) A waterfall-like outpouring of liquid, smoke, etc. / (technical, computing, slang) Waterfall model

(intransitive) To fall like a waterfall. / (transitive) To drink (something) from a container by pouring it from a height so as not to touch one's lips to the rim. / (roller derby) Synonym of recycle

So tightly made that water cannot enter or escape. / (figuratively) So devised or planned as to be impossible to defeat, evade or nullify.

(hydrology, UK, Ireland, Australia, New Zealand) The topographical boundary dividing two adjacent catchment basins, such as a ridge or a crest.

Serving to mark a significant development, change in direction, etc.

soaked with water / (nautical) in danger of sinking because of excess water onboard