unsigned
adj. B2 Upper Intermediate US //ənˈsaɪnd// UK //ʌnsˈaɪnd// un·signed
adj. describing a document or piece of work that does not have a signature or a name on it.
adj. lacking a signature or formal identification of authorship. In computing, refers to software or code that has not been verified by a digital certificate.
The bank rejected the unsigned check.
The operating system warned the user that installing unsigned drivers could lead to security vulnerabilities.
Historians debated the origin of the unsigned manuscript, searching for stylistic clues that might link the text to a known 18th-century philosopher.
From un- + signed.
Usage
Often used attributively before a noun; in technical contexts, it can also describe a numeric variable that cannot represent negative values.