Rest·ful a.
  1. Being at rest; quiet.
  2. Giving rest; freeing from toil, trouble, etc.
     Tired with all these, for restful death I cry.   --Shak.
  -- Rest*ful*ly, adv. -- Rest*ful*ness, n.
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  restfulness
       n : the attribute of being restful; "he longed for the
           restfulness of home"