Source : Webster's Revised Unabridged Dictionary (1913)

Intolerant \In*tol"er*ant\, a. [L. intolerans, -antis: cf. F.
   intol['e]rant. See {In-} not, and {Tolerant}.]
   1. Not enduring; not able to endure.

            The powers of human bodies being limited and
            intolerant of excesses.               --Arbuthnot.

   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.

            Religion, harsh, intolerant, austere, Parent of
            manners like herself severe.          --Cowper.

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

Source : WordNet®

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