Source : Webster's Revised Unabridged Dictionary (1913)

Uneven \Un*e"ven\, a. [AS. unefen. See {Un-} not, and {Even},
   a.]
   1. Not even; not level; not uniform; rough; as, an uneven
      road or way; uneven ground.

   2. Not equal; not of equal length.

            Hebrew verse consists of uneven feet. --Peacham.

   3. Not divisible by two without a remainder; odd; -- said of
      numbers; as, 3, 7, and 11 are uneven numbers.
      {Un*e"ven*ly}, adv. -- {Un*e"ven*ness}, n.

Source : WordNet®

unevenness
     n 1: a quality of variability and lack of uniformity [syn: {variability}]
          [ant: {evenness}, {evenness}]
     2: the quality of being unbalanced [ant: {evenness}]