Plumbeous is an adjective that means ‘dull gray in color.’ 

Our word of the day gets its origin from the Latin word plumbum (PLUME boom) which means ‘lead.’ By the late 16th century, plumbeous became the word to describe the color of lead. Here’s an example:

When we first moved into our home, we knew we had some painting to do. Neither one of us were fond of the plumbeous walls. That dull gray just didn’t excite us.