Avaricious, covetous, greedy, rapacious share the sense of desiring to possess more of something than one already has or might in normal circumstances be entitled to. Avaricious often implies a pathological, driven greediness for money or other valuables and usually suggests a concomitant miserliness: the cheerless dwelling of an avaricious usurer. Covetous implies a powerful and usually illicit desire for the property or possessions of another: The book collector was openly covetous of my rare first edition. Greedy, the most general of these terms, suggests a naked and uncontrolled desire for almost anything—food and drink, money, emotional gratification: embarrassingly greedy for praise. Rapacious, stronger and more assertive than the other terms, implies an aggressive, predatory, insatiable, and unprincipled desire for possessions and power: a rapacious frequenter of tax sales and forced auctions.

Did you mean capriciousness?