Source : Webster's Revised Unabridged Dictionary (1913)

Tameness \Tame"ness\, n.
   The quality or state of being tame.

Source : WordNet®

tameness
     n 1: the quality of being vapid and unsophisticated [syn: {jejunity},
           {jejuneness}, {vapidity}, {vapidness}]
     2: the attribute of having been domesticated [syn: {domestication}]
        [ant: {wildness}]