the answer is dull colour
The colour grey represents regret because its dull colour.
Dull silvery white.
either white or a dull yellow colour
green or some dull colour
Dun could be a dull greyish-brown colour, or a horse.
Many animals are dull colored in order to better blend in with their natural habitats and avoid predation.
drab means dull, uninteresting; of dull brownish colour. drabbing however, is a Shakespearean term implying whoring or visiting prostitutes.
Mustard.
My mother had bought me a new bucket of 'Nipton' paint to decorate my room, but I didn't like the colour because it was too dull.
Because dull black is the best colour for spy aircraft
It can, but is usually more of a gray colour.