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]

Moby Thesaurus II by Grady Ward, 1.0:

101 Moby Thesaurus words for "hidebound":
   Quakerish, Sabbatarian, Victorian, authoritarian, bigot, bigoted,
   borne, censorious, closed, conservative, constricted, conventional,
   cramped, creedbound, deaf, deaf to reason, demure, dogmatic, dour,
   evangelical, fanatical, firm, fundamentalist, hard, hyperorthodox,
   illiberal, impliable, inexorable, inflexible, insular, intolerant,
   intractable, iron, ironbound, ironclad, ironhanded, literalist,
   literalistic, little, little-minded, mean, mean-minded,
   mean-spirited, mid-Victorian, muscle-bound, narrow, narrow-hearted,
   narrow-minded, narrow-souled, narrow-spirited, nearsighted,
   obdurate, obstinate, old-maidish, orthodox, overmodest, parochial,
   petty, precisianist, precisianistic, priggish, prim, procrustean,
   provincial, prudish, purblind, purist, puristic, puritan,
   puritanic, puritanical, reactionary, relentless, restricted, rigid,
   rigorist, rigoristic, rigorous, rockbound, sanctimonious,
   shortsighted, small, small-minded, smug, staunch, stiff,
   stiff-necked, straightlaced, strait-laced, straitlaced, strict,
   stubborn, stuffy, unbending, uncatholic, uncharitable,
   uncompromising, ungenerous, unliberal, unrelenting, unyielding