unsecured adj: not secured: as
a : not guaranteed or protected as to payment, performance, or satisfaction by a security interest or by property given or pledged as security [ debt] [an claim]
b : characterized by a lack of security or of a security interest [ status]
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.