The Collaborative International Dictionary
Robustiousness
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.
[1913 Webster] -- Ro*bus"tious*ly, adv. --
Ro*bus"tious*ness, n.
Wiktionary
robustiousness
n. Quality of being robustious.