sunfast

[suhn-fast, -fahst]

adjective

not subject to fading in sunlight, as a dye, fabric, or garment.

Origin of sunfast

First recorded in 1925–30; sun + fast¹

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for sunfast

sunfast

adjective

mainly US and Canadian not fading in sunlight

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