Source : Webster's Revised Unabridged Dictionary (1913)

Masterless \Mas"ter*less\, a.
   Destitute of a master or owner; ungoverned or ungovernable.
   -- {Mas"ter*less*ness}, n.

Source : WordNet®

masterless
     adj : having no lord or master; "harsh punishments for sturdy
           vagabonds and masterless men" [syn: {lordless}]