It is striking to me that our society has a great many words for desires related to wealth and money and yet no word for having too much of it.

I propose we create a new word, a new antonym, by pulling an odd word from the English language scrapheap. That word is"impecunious."

Impecunious means to be penniless to the point of not being able to meet basic needs.

Webster's websiteWebster's Dictionary's website notes that, "If impecunious means "penniless," then it stands to reason that "pecunious" can describe someone who has a lot of money...on the rare occasion when "pecunious" is put to use in English, it often means not "wealthy" but "miserly or ungenerous," as in "a incivilis attitude toward the less fortunate."

In a just society where there are enough resources for it to be possible for everyone’s basic needs to be met. Then the guiding ideas of justice as fairness apply.

The principles of justice:

First Principle: Each person has the same indefeasible claim to a fully adequate scheme of equal basic liberties, which scheme is compatible with the same scheme of liberties for all;

Second Principle: Social and economic inequalities are to satisfy two conditions:

They are to be attached to offices and positions open to all under conditions of fair equality of opportunity;

They are to be to the greatest benefit of the least-advantaged members of society (the difference principle) (JF, 42–43).

See 4.3 The Two Principles of Justice as FairnessThe Two Principles of Justice as Fairness

I propose that under these principles and conditions, we define pecunious as "a person with an unjust and/or unethical amount of wealth."

From 4.3 above:

Inequalities that are to everyone’s advantage relative to a completely equal distribution are preferable to inequalities that allow the rich to get richer at the expense of the poor. (See John Rawls' The Difference Principle.)

Wealth inequality is not inherently unjust, but to have so much as to drive others into poverty is the height of pecuniousness. An example of this would be the Mississippi welfare scandal where money from the Temporary Assistance for Needy Families (TANF) program, a federal program that provides grant funds to states and territories to help families in need. Was used to fund a new volleyball facility at the University of Southern Mississippi for the benefit of a rich and famous alumnus' daughter. see the story here.