lightfast

 [lahyt-fast, -fahst]  

light·fast

   [lahyt-fast, -fahst]
adjective
not affected or faded by light, especially sunlight; colorfast when exposed to light.
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Origin:
1955–60; light1 + fast1

Related forms
light·fast·ness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Lightfast is always a great word to know.
So is flibbertigibbet. Does it mean:
a gadget; dingus; thingumbob.
a chattering or flighty, light-headed person.
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