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.]
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   1. Not enduring; not able to endure.
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            The powers of human bodies being limited and
            intolerant of excesses.               --Arbuthnot.
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   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.
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            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]