Greyish is an adjective used to describe a color that's somewhat between gray and another color. Some synonyms for greyish include ashen, drab, dull, faded, murky, neutral, pale, silvery, smoky, and washed-out. If you're looking for a darker, more somber shade, you could use charcoal, slate, or gunmetal. For a lighter shade, you might use ash or silver. If you're looking for a color that's subtly different from gray, but still earthy and muted, you could use beige, taupe, or khaki. All of these shades can be described as greyish, and can help you add depth and nuance to your word choices.