The Collaborative International Dictionary of English v.0.48:

Narrow-minded \Nar"row-mind`ed\, a.
   Of narrow mental scope; lacking tolerance or breadth of view;
   illiberal; mean. Opposite of broad-minded, open-minded,
   liberal. [WordNet sense 2] [Narrower terms: dogmatic,
   dogmatical; little, petty, small, small-minded]

   Syn: narrowminded, narrow, illiberal, intolerant.
        [1913 Webster + WordNet 1.5]

   2. Capable of being shocked by behavior of others. Opposite
      of unshockable. [WordNet sense 1]

   Syn: shockable.
        [WordNet 1.5 +PJC] -- Nar"row-mind`ed*ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

narrow-minded
    adj 1: capable of being shocked [syn: shockable, narrow-
           minded] [ant: broad-minded, unshockable]
    2: lacking tolerance or flexibility or breadth of view; "a
       brilliant but narrow-minded judge"; "narrow opinions" [syn:
       narrow-minded, narrow] [ant: broad-minded]
    3: rigidly adhering to a particular sect or its doctrines

Moby Thesaurus II by Grady Ward, 1.0:

28 Moby Thesaurus words for "narrow-minded":
   biased, bigoted, conservative, conventional, fundamentalist,
   hidebound, illiberal, intolerant, mean-minded, mean-spirited,
   narrow, narrow-spirited, old-fashioned, old-fogyish, one-sided,
   opinionated, parochial, pettifogging, petty, prejudiced,
   puritanical, reactionary, small-minded, square, stiff-necked,
   strait-laced, stuffy, unprogressive