water-fast

[ waw-ter-fast, -fahst, wot-er- ]
/ ˈwɔ tərˌfæst, -ˌfɑst, ˈwɒt ər- /

adjective

(of a color or dye) resistant to the effects caused by water; not changed or faded by the action of water.

Origin of water-fast

First recorded in 1540–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019