Not changing.
A term describing a state of health or disease from which little imminent change is expected.
In medical contexts, the term is used to describe a patient whose condition is stable, showing neither improvement nor decline. It can also refer to an individual with a personality that is resilient to mental illness, or to a chemical substance that remains consistent in its composition, physical state, or lacks radioactivity.
Resistant to breakdown or dissolution; likely to maintain its composition when subjected to physical or chemical forces.