The Collaborative International Dictionary of English v.0.48:

Intolerant \In*tol"er*ant\ ([i^]n*t[o^]l"[~e]r*ant), a. [L.
   intolerans, -antis: cf. F. intol['e]rant. See In- not, and
   Tolerant.]
   [1913 Webster]
   1. Not enduring; not able to endure.
      [1913 Webster]

            The powers of human bodies being limited and
            intolerant of excesses.               --Arbuthnot.
      [1913 Webster]

   2. Not tolerating difference of opinion or sentiment,
      especially in religious matters; refusing to allow others
      the enjoyment of their opinions, rights, or worship;
      unjustly impatient of the opinion of those disagree with
      us; not tolerant; unforbearing; bigoted.
      [1913 Webster]

            Religion, harsh, intolerant, austere,
            Parent of manners like herself severe. --Cowper.
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The Collaborative International Dictionary of English v.0.48:

Intolerant \In*tol"er*ant\, n.
   An intolerant person; a bigot.
   [1913 Webster]

WordNet (r) 3.0 (2006):

intolerant
    adj 1: unwilling to tolerate difference of opinion [ant:
           tolerant]
    2: narrow-minded about cherished opinions [syn: illiberal,
       intolerant]

Moby Thesaurus II by Grady Ward, 1.0:

76 Moby Thesaurus words for "intolerant":
   ageist, antipathetic, averse, balking, balky, biased, bigoted,
   bulldogged, bulletheaded, bullheaded, case-hardened, classist,
   contemptuous, discriminatory, disdainful, dogged, dogmatic,
   fanatic, fractious, hardheaded, headstrong, hidebound, illiberal,
   impatient, inconsiderate, indignant, inflexible, inhospitable,
   irate, irritable, jaundiced, mulish, narrow, narrow-minded,
   obdurate, obstinate, one-sided, opinionated, outraged, overzealous,
   parochial, partial, persevering, pertinacious, pigheaded,
   prejudiced, provincial, racist, restive, self-willed, set, sexist,
   small-minded, snappish, stiff-necked, strong-willed, strongheaded,
   stubborn, stuffy, sulky, sullen, tenacious, twisted, uncharitable,
   uncondoning, uncooperative, unforbearing, unindulgent,
   unregenerate, unsympathetic, upset, warped, waspish, willful,
   worked up, xenophobic