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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.