Chestnut-colored is often described as a rich, warm, reddish-brown shade. Its antonyms would be words that refer to colors that are opposite in nature, such as cool, light or dull. The antonyms for chestnut-colored could include words like pale, ash-colored, grey, or white. Other antonyms could be dark, black, deep, or ebony. These words can be used to describe shades that are in complete contrast to chestnut-colored shades. Interestingly, there is not always a perfect antonym for a certain color, as different shades of color may have multiple opposite qualities. Hence, one must choose antonyms that have the closest opposite meaning to the word "chestnut-colored.