Source : Webster's Revised Unabridged Dictionary (1913)

-- {In*tru"sive*ly}, adv. -- {In*tru"sive*ness}, n.

Source : WordNet®

intrusiveness
     n : aggressiveness as evidenced by intruding; by advancing
         yourself or your ideas without invitation [syn: {meddlesomeness},
          {officiousness}]