IPA: /əˈkrəʊˌmætɪk/
KK: /əˈkrōˌmatik/
This word describes something that lacks color or hue, often referring to shades like black, white, or gray. It can also relate to things that do not show any color separation, such as certain types of light or musical tones.
The artist chose an achromatic palette for the painting to emphasize the shapes rather than the colors.
Achromatic → It is formed from "a-" (meaning without) and "chroma" (from Greek "chroma", meaning color). The word "achromatic" means without color or colorless.
Think of 'without' ('a-') and 'color' ('chroma') to remember that achromatic refers to something that is without color.