Unsecured Creditor

An individual or institution that lends money without obtaining specified assets as collateral. This poses a higher risk to the creditor because they have nothing to fall back on should the borrower default on the loan. A debenture holder is an unsecured creditor.

Investopedia Says:
It's uncommon for individuals to be able to borrow money without collateral. For example, when you take out a mortgage, a bank will always hold your house as collateral for the loan in case you default. Large corporations however often issue commercial paper that is unsecured.

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General creditor of a debtor filing a Voluntary Bankruptcy petition, who does not hold a Security Interest in the debtor's assets or backing by a Mortgage. In a Chapter 7 Liquidation general creditors are paid a pro rata share of the bankruptcy Estate after claims of secured creditors are satisfied, which means that most general creditors can receive substantially less than the value of their claim.