noun. Abnormal rearward curvature of the spine, resulting in protuberance of the upper back; hunchback.

noun. In pathology, a curvature of the spine, convex backward. Also written cyphosis.

noun. An abnormal curvature of the spine, causing a hunchback.

noun. an abnormal backward curve to the vertebral column

"This, in turn, leads to a flexed section of spine and a pronounced "kyphosis" - a curve in the lower back - creating the hunched posture that you have noticed."

gibbous  humpback  hunchback  lordosis  scoliosis  

kyphotic  

spinal curvature