← BackshareGuessachromatous/eɪˈkroʊmətəs/adjectiveHaving no color; colorless or very pale.The achromatous jellyfish was almost invisible in the clear water.Her achromous complexion was a result of the illness.The achromatous rock sample contained no minerals that would give it a hue.SynonymscolorlesspaleAntonymscolorful