Unsigned (adjective)

1. Not having a signature or marking indicating approval.
2. Lacking official authorization or endorsement.

Origin:

From the old english word 'un' meaning 'not' and 'sine' meaning 'signed'.

Examples:

1. The unsigned document was not legally binding.
2. The unsigned contract was considered void.
3. The unsigned check was not valid.
4. The unsigned letter was not considered official.
5. The unsigned agreement was not enforceable.