Source : Webster's Revised Unabridged Dictionary (1913)

Ignorant \Ig"no*rant\, a. [F., fr. L. ignorans, -antis, p. pr.
   of ignorare to be ignorant. See {Ignore}.]
   1. Destitute of knowledge; uninstructed or uninformed;
      untaught; unenlightened.

            He that doth not know those things which are of use
            for him to know, is but an ignorant man, whatever he
            may know besides.                     --Tillotson.

   2. Unacquainted with; unconscious or unaware; -- used with
      of.

            Ignorant of guilt, I fear not shame.  --Dryden.

   3. Unknown; undiscovered. [Obs.]

            Ignorant concealment.                 --Shak.

            Alas, what ignorant sin have I committed? --Shak.

   4. Resulting from ignorance; foolish; silly.

            His shipping, Poor ignorant baubles! -- on our
            terrible seas, Like eggshells moved.  --Shak.

   Syn: Uninstructed; untaught; unenlightened; uninformed;
        unlearned; unlettered; illiterate. -- {Ignorant},
        {Illiterate}. Ignorant denotes want of knowledge, either
        as to single subject or information in general;
        illiterate refers to an ignorance of letters, or of
        knowledge acquired by reading and study. In the Middle
        Ages, a great proportion of the higher classes were
        illiterate, and yet were far from being ignorant,
        especially in regard to war and other active pursuits.

              In such business Action is eloquence, and the eyes
              of the ignorant More learned than the ears.
                                                  --Shak.

              In the first ages of Christianity, not only the
              learned and the wise, but the ignorant and
              illiterate, embraced torments and death.
                                                  --Tillotson.

Ignorant \Ig"no*rant\, n.
   A person untaught or uninformed; one unlettered or unskilled;
   an ignoramous.

         Did I for this take pains to teach Our zealous
         ignorants to preach?                     --Denham.

Source : WordNet®

ignorant
     adj 1: lacking general education or knowledge; "an ignorant man";
            "nescient of contemporary literature"; "an unlearned
            group incapable of understanding complex issues";
            "exhibiting contempt for his unlettered companions"
            [syn: {nescient}, {unenlightened}, {unlearned}, {unlettered}]
     2: ignorant of the fundamentals of a given art or branch of
        knowledge; "ignorant of quantum mechanics"; "musically
        illiterate" [syn: {illiterate}]
     3: lacking basic knowledge; "how can someone that age be so
        ignorant?"; "inexperienced and new to the real world"
        [syn: {inexperienced}]
     4: used of things; lacking sense or awareness; "ignorant hope";
        "fine innocent weather" [syn: {innocent}]
     5: lacking knowledge or skill; "unversed in the jargon of the
        social scientist" [syn: {unversed}] [ant: {versed}]
     6: lacking information or knowledge; "an unknowledgeable
        assistant" [syn: {unknowledgeable}, {unknowing}, {unwitting}]