zeronaire
Zeronaire is the extreme opposite of a millionaire.
You see more and more zeronaires in the streets today, begging for some money.
below-zeronaire
Below-zeronaire is even worse than a zeronaire. All a below-zeronaire's got is debts. Often an ex-millionaire.
You remember Bill Gates? Yeah, he used to be a squillionaire, and look at him now! He ended up as a below-zeronaire!