Source : Webster's Revised Unabridged Dictionary (1913)

Safeness \Safe"ness\, n.
   The quality or state of being safe; freedom from hazard,
   danger, harm, or loss; safety; security; as the safeness of
   an experiment, of a journey, or of a possession.

Source : WordNet®

safeness
     n : the quality of being safe [ant: {dangerousness}]