reproduction or execution in shades of one colour, black and white, or shades of grey

a painting, drawing, or photograph in monochrome

of or executed in shades of a single colour

reproducing or transmitting visual images in black, white, and tones of grey; black-and-white

monochrome television

a monochrome photograph

lacking in variety or interest; dull

Universities these days are desperately monochrome — N Smart