This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of a single colour; monochromatic.

adj. Made, or done, with a single color. Called also, monochromatic and monochrome.

Of one color; pertaining to or of the nature of monochromy; monochromical.

adj. having or appearing to have only one color

"These large, square, subtly lit monochromic photographs have constituted her signature works since 2001."

coloured    colorful    colored   

monochromatic    monochrome   

vervet    wired-up    big-eared    god-cursed    lower-ranking    rhesus    repulsive-looking    tree-climbing    six-armed    frugivorous