monochromatic

US /ˌmɑː.noʊ.krəˈmæt̬.ɪk/
UK /ˌmɑː.noʊ.krəˈmæt̬.ɪk/
1.

đơn sắc

using only black, white, and gray, or using only one color:

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He is noted for his monochromatic paintings in oils and pastels.