Not likely to change or fail; firmly established. The economy has been stable for the past few years, with consistent growth and low inflation.
Not easily upset or disturbed; calm and dependable. She is known for her stable personality, always remaining calm under pressure.
In a state of equilibrium or balance; not likely to tip or fall over. The table is stable, even with all the heavy books stacked on one side.
Chemically or physically resistant to change, decomposition, or radioactive decay. The isotope is stable and does not undergo radioactive decay.
Of, relating to, or intended for a stable (a building for horses or livestock). He bought a stable rug to keep the horse warm during winter.