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.

Source : WordNet®

robustious
     adj : noisy and lacking in restraint or discipline; "a boisterous
           crowd"; "a social gathering that became rambunctious
           and out of hand"; "a robustious group of teenagers";
           "beneath the rumbustious surface of his paintings is
           sympathy for the vulnerability of ordinary human
           beings"; "an unruly class" [syn: {boisterous}, {rambunctious},
            {rumbustious}, {unruly}]