As nouns the difference between imperiousness and overbearance
is that imperiousness is the quality of being imperious; arrogance; haughtiness; urgency while overbearance is (rare|or|obsolete) overbearing behaviour; arrogance; imperiousness.
imperiousness
English
Noun
(-)
The quality of being imperious; arrogance; haughtiness; urgency.
References
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overbearance
English
Noun
(-)
(rare, or, obsolete) Overbearing behaviour; arrogance; imperiousness.