Source : Webster's Revised Unabridged Dictionary (1913)

Inexperience \In`ex*pe"ri*ence\, n. [L. inexperientia, cf. F.
   inexp['e]rience. See {In-} not, and {Experience}.]
   Absence or want of experience; lack of personal and
   experimental knowledge; as, the inexperience of youth.

         Failings which are incident to youth and inexperience.
                                                  --Dryden.

         Prejudice and self-sufficiency naturally proceed from
         inexperience of the world, and ignorance of mankind.
                                                  --Addison.

Source : WordNet®

inexperience
     n : lack of experience and the knowledge and understanding
         derived from experience [ant: {experience}]