Suptilian

Suptilian, also known as Suptiligender or Solidgender refers to a gender in which one's gender identity and their gender's intensity are both precise, 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.