"Dull colors" refers to colors that are not vibrant or bright. They might seem faded or lacking in brightness or intensity.
Sentences with «dull colors»
There is something so irresistible about a white against the dark, dull colors of fall and winter so throw your white rule to the wind and wear it all winter long! (sophieandtrey.com)
Then go for bright red pants, wear it with your favorite white dress shirt and complete a look with dull color blazer of leather or velvet. (outfittrends.com)
A most common aging stereotype is to wear dull colors only or you would look out of the way. (outfittrends.com)