Definitions

1. adjective

capable of resisting or withstanding the effects of the sun, especially in terms of the resistance of a sailing boat to being slowed down by the sun.

“The sunfast paint we used on our boat has helped it withstand the harsh summer sun.”

2. adjective

capable of being used or applied in sunlight, especially in terms of paints or coatings.

“The artist used sunfast pigments to create a vibrant mural that could be viewed during the day.”