From The Collaborative International Dictionary of English v.0.48 [gcide]:
Usage: These words express different degrees of angry feeling or language. Asperity and harshness arise from angry feelings, connected with a disregard for the feelings of others. Harshness usually denotes needless severity or an undue measure of severity. Acrimony is a biting sharpness produced by an imbittered spirit. Tartness denotes slight asperity and implies some degree of intellectual readiness. Tartness of reply; harshness of accusation; acrimony of invective.
From WordNet (r) 3.0 (2006) [wn]:
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Eye and Pyramid BANKING REFORM CHALLENGE