gray 1 also grey (grā) Pronunciation Key adj. gray·er also grey·er, gray·est also grey·est Of or relating to an achromatic color of any lightness between the extremes of black and white. Dull or dark: a gray, rainy afternoon. Lacking in cheer; gloomy: a gray mood. Having gray hair; hoary. Old or venerable. Intermediate in character or position, as with regard to a subjective matter: the gray area between their differing opinions on the film's morality.