Suptilian

Suptilian, also known as Suptiligender, Solidgender, or Gendersolid refers to a gender experience in which one's gender identity and their gender's intensity are both unchanging, stable, not flexible, and strictly static. It is not fluid or fluctuating.

It is the opposite of amplusian. It can also be described as when one is both diastimian and kymenian. It can be used as an umbrella term for any non-fluid, non-fluctuating gender.

The orientation equivalent is suptilic.

History
Gendersolid appears to have been first used on or before May 27, 2014 by Tumblr user askanonbinary. Gendersolid is often used as a humorous way to refer to people who are not genderfluid.

It is unknown who created the term suptilian. It was either created by arco-pluris or anthropomimus some time in early 2018.

Flag
The suptilian flag was created by anthropomimus on or before July 21, 2018.

The gendersolid flag was created by arco-pluris on June 3, 2018.