Source : Webster's Revised Unabridged Dictionary (1913)

Robustious \Ro*bus"tious\, a. [Cf. L. robusteus of oak.]
   Robust. [Obs. or Humorous] --W. Irving.

         In Scotland they had handled the bishops in a more
         robustious manner.                       --Milton.
   -- {Ro*bus"tious*ly}, adv. -- {Ro*bus"tious*ness}, n.