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lightfast

[ lahyt-fast, -fahst ]
/ ˈlaɪtˌfæst, -ˌfɑst /
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adjective
not affected or faded by light, especially sunlight; colorfast when exposed to light.
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Origin of lightfast

First recorded in 1955–60; light1 + fast1

OTHER WORDS FROM lightfast

lightfastness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use lightfast in a sentence

  • Ironically, the red paint made decades ago was relatively lightfast, because the color came from iron oxide, which keeps its color in the sun just as red, iron-rich soil found in some parts of the country does.

British Dictionary definitions for lightfast

light-fast

adjective
(of a dye or dyed article) unaffected by light
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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