crook·back /ˈkrʊkˌbæk/
  駝背
  Crook·back n. A crooked back; one who has a crooked or deformed back; a hunchback.
  Crook·back, a. Hunched.
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  crookback
       adj : characteristic of or suffering from kyphosis, an abnormality
             of the vertebral column [syn: crookbacked, humped,
             humpbacked, hunchback, hunchbacked, gibbous, kyphotic]
       n : a person whose back is hunched because of abnormal curvature
           of the upper spine [syn: humpback, hunchback]