The Collaborative International Dictionary of English v.0.48:

Hidebound \Hide"bound`\, a.
   1. Having the skin adhering so closely to the ribs and back
      as not to be easily loosened or raised; -- said of an
      animal.
      [1913 Webster]

   2. (Hort.) Having the bark so close and constricting that it
      impedes the growth; -- said of trees. --Bacon.
      [1913 Webster]

   3. Untractable; bigoted; obstinately and blindly or stupidly
      conservative. --Milton. Carlyle.
      [1913 Webster]

   4. Niggardly; penurious. [Obs.] --Quarles.
      [1913 Webster]

WordNet (r) 3.0 (2006):

hidebound
    adj 1: stubbornly conservative and narrow-minded [syn:
           hidebound, traditionalist]