Robustious \Ro*bus"tious\, a. [Cf. L. robusteus of oak.] Robust. [Obs. or Humorous] --W. Irving. [1913 Webster] In Scotland they had handled the bishops in a more robustious manner. --Milton. [1913 Webster] -- {Ro*bus"tious*ly}, adv. -- {Ro*bus"tious*ness}, n. [1913 Webster]