Source : Webster's Revised Unabridged Dictionary (1913)

Tortious \Tor"tious\, a. [From {Tort}.]
   1. Injurious; wrongful. [Obs.] ``Tortious power.'' --Spenser.

   2. (Law) Imploying tort, or privat injury for which the law
      gives damages; involing tort.

Source : WordNet®

tortious
     adj : of or pertaining to the nature of a tort; "tortious acts"