The Collaborative International Dictionary of English v.0.48:

Unmeaning \Un*mean"ing\, a.
   1. Having no meaning or signification; as, unmeaning words.
      [1913 Webster]

   2. Not indicating intelligence or sense; senseless;
      expressionless; as, an unmeaning face.
      [1913 Webster]

            There pride sits blazoned on the unmeaning brow.
                                                  --Trumbull.
      [1913 Webster] -- Un*mean"ing*ly, adv. --
      Un*mean"ing*ness, n.
      [1913 Webster]