Tom remains underfunded to start up a business.
The context is that this man has an excellent business plan and entrepreneurial spirit. But the bank wouldn't lend him money in absence of collateral.
In my view, the word "underfunded" properly stresses the fact that Tom lacks capital. However, according to Collins Dictionary, this word in most cases modify an organization or services. Are there any words that would fit in better?
To clarify, Tom LACKS enough funding. Still, he may turn to other institutions other than banks, a solution not very practical because the former ones charge exorbitantly high interest rate.