The grey-sided thrush is a medium-sized, warm-brown thrush with a white and crescent below the eye. The male has rufescent-olive upperparts, including the crown and ear-coverts, and grey underparts becoming paler on the belly and. The female has a white throat and whiter centre to the breast and belly, some dark spots or streaks on the sides of the throat and upper breast and warmbrownish fringes to the breast feathers.