different between imperious vs imperiousness

English

From Latin imperi?sus (“mighty, powerful”), from imperium (“command, authority, power”)

imperious (not comparable)

Domineering, arrogant, or overbearing.
- 1866 – Fyodor Dostoyevsky, The Gambler, translated by C. J. Hogarth
  ...she glanced about her in an imperious, challenging sort of way, with looks and gestures that clearly were unstudied.
Urgent.
- 1891 – Ambrose Bierce, An Occurrence at Owl Creek Bridge
  Circumstances of an imperious nature, which it is unnecessary to relate here, had prevented him from taking service with that gallant army which had fought the disastrous campaigns ending with the fall of Corinth.
(obsolete) Imperial or regal.
- 1899 – Stephen Crane, The Angel Child, Whilomville Stories
  She was quick, beautiful, imperious, while he was quiet, slow, and misty.

imperious +? -ness

imperiousness (usually uncountable, plural imperiousnesses)

imperiousness in The Century Dictionary, New York, N.Y.: The Century Co., 1911.

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