A very large, slender cat with a small head, small rounded ears that are not tufted, very powerful shoulders and hindquarters, and a long, heavy, cylindrical tail. The coloration in adults is uniform. Upperparts are grizzled gray or dark brown to buff, cinnamon tawny, or rufous. Underparts are dull whitish overlaid with buff across the abdomen. The sides of the muzzle are black, and the chin and throat are white. The last two to three inches of the tail are black.