Adamasgender is a gender that refuses to be categorized, and is completely indefinable and indomitable. One can be exclusively adamasgender or not.
History
The term Admasgender seems to have been first coined on a site that mocks non-binary people, however this site was taken down. The terms coined there were reposted by the Transgender Teen Survival Guide on December 26, 2016 and have been used in a better light since. It is unknown if the person who posted these terms was aware whether or not the site they posted them on was offensive.