Source : Webster's Revised Unabridged Dictionary (1913)

Staidness \Staid"ness\, n.
   The quality or state of being staid; seriousness; steadiness;
   sedateness; regularity; -- the opposite of wildness, or
   {levity}.

         If sometimes he appears too gray, yet a secret
         gracefulness of youth accompanies his writings, though
         the staidness and sobriety of age wanting. --Dryden.

   Syn: Sobriety; gravity; steadiness; regularity; constancy;
        firmness; stability; sedateness.

Source : WordNet®

staidness
     n : a trait of dignified seriousness [syn: {sedateness}, {solemnity},
          {solemness}]