Having a color that does not attract attention(adjective)
WordNet. Princeton University. 2010.
Use "neutral-colored" in a sentence
"Paul Dyer for The Wall Street Journal The interior of the house, including the living room, shown here, has mostly wood antiques and comfortable, neutral-colored sofas, gold mirrors, antique light fixtures—all meant to be timeless rather than trendy, so it shouldn't have to be replaced every few years."
"I'm not yet convinced that everyone "needs" a neutral-colored coat — but that might just be because I can't see any shade of caramel working if one has young children or a lifestyle that includes using public transport."
"For older women, she says, bright or pastel colors are best worn in simple pieces, such as a classic button-up blouse in lilac — balanced with neutral-colored pieces such as a cream linen pencil skirt."