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lightfast

[lahyt-fast, -fahst] /ˈlaɪtˌfæst, -ˌfɑst/
adjective
1.
not affected or faded by light, especially sunlight; colorfast when exposed to light.
Origin
1955-1960
1955-60; light1 + fast1
Related forms
lightfastness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for light-fast

light-fast

adjective
1.
(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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Word Value for light

9
10
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