Source : Webster's Revised Unabridged Dictionary (1913)

Vexatious \Vex*a"tious\, a. [See {Vexation}.]
   1. Causing vexation; agitating; afflictive; annoying; as, a
      vexatious controversy; a vexatious neighbor. ``Continual
      vexatious wars.'' --South.

   2. Full or vexation, trouble, or disquiet; disturbed.

            He leads a vexatious life.            --Sir K.
                                                  Digby.

   {Vexatious suit} (Law), a suit commenced for the purpose of
      giving trouble, or without cause. -- {Vex*a"tious*ly},
      adv. -- {Vex*a"tious*ness}, n.