WordNet sense 1 (a person whose back is hunched because of abnormal curvature of the upper spine):

humpback, hunchback

WordNet sense 2 (characteristic of or suffering from kyphosis, an abnormality of the vertebral column):

gibbous, humpbacked, humped, hunchbacked, crookbacked, kyphotic

WordNet sense 3 (not in good physical or mental condition; out of condition):

unfit