stable

sta·ble

adj \ˈstā-bəl\

sta·bler \-b(ə-)lər\ sta·blest \-b(ə-)ləst\

Definition of STABLE

1

: not changing or fluctuating <the patient's condition was listed as stable>

2

: not subject to insecurity or emotional illness <a stable personality>

3

a : not readily altering in chemical makeup or physical state <stable emulsions> b : not spontaneously radioactive <a stable isotope>