sunfast

[ suhn-fast, -fahst ]
/ ˈsʌnˌfæst, -ˌfɑst /

adjective

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

Origin of sunfast

First recorded in 1925–30; sun + fast1

British Dictionary definitions for sunfast

sunfast
/ (ˈsʌnˌfɑːst) /

adjective

mainly US and Canadian not fading in sunlight