The Collaborative International Dictionary of English v.0.48:

Humped \Humped\, a.
   Having a hump, as the back.
   [1913 Webster]

WordNet (r) 3.0 (2006):

humped
    adj 1: characteristic of or suffering from kyphosis, an
           abnormality of the vertebral column [syn: crookback,
           crookbacked, humped, humpbacked, hunchbacked,
           gibbous, kyphotic]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "humped":
   arched, arciform, arclike, arcual, bandy, bowed, bowlike,
   bunchbacked, camelback, concave, convex, convexed, crookbacked,
   embowed, excurvate, excurvated, excurved, gibbose, gibbous,
   humpbacked, humpy, hunchbacked, hunched, hunchy, kyphotic,
   out-bowed, oxbow, rotund, vaulted