Arrogate: (1) to claim unwarrantably or presumptuously; assume or appropriate to oneself without right; to arrogate the right to make decisions; (2) to attribute or assign to another; ascribe [153-1540] L. arrogatus appropriated; equiv. to ar + rogare to ask, propose + atus.
Arrogant: (1) making claims or pretensions to superior importance or rights; overbearingly assuming, insolently proud: an arrogant public official (2) characterized by or proceeding from arrogance: arrogant claims; presuming. prp. of arrogare. See arrogate.
Syn: presumptuous, haughty, imperious, brazen; see proud.
Ant: meek, modest, humble
Arrogance: offensive display of superiority or self-importance; overbearing pride.
Syn: haughtiness, insolence, disdain
Arrogance of power: presumption on the part of a nation that its power gives it the right to intervene in the affairs of less powerful nations [1965-1970].
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The United States is sometimes accused of behaving in an arrogant manner.
The current Bush-Cheney administration, which has less than a year to go before expiring, as Pres. Bush is term limited after two terms, is sometimes seen as arrogant.
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Arrogance is what is usually said to precede a fall, as in "Pride goeth before a fall."
Good luck, us.