nonsigner

noun

non·​sign·​er ˌnän-ˈsī-nər 

plural nonsigners

: one that does not sign something (such as a treaty) : one that is not a signatory

The nonsigners include some of the most conservative members of the Senate.

—Byron York

… the treaty does carry moral and diplomatic weight that could discourage … nonsigners from using the weapons.

—The Chattanooga Times Free Press

Word History

First Known Use

1889, in the meaning defined above