Steady; not varying; resistant to change.
1. not moving, fixed, firm.
1. not moving, fixed, firm. 2. constant (def. 1).
1. Resistant to change of position or condition. 2. Not showing or marked by erratic or volatile emotions or behavior. 3. Having no known mode of decay; indefinitely long-lived. Used of atomic particles. 4. Not easily decomposed or otherwise modified chemically.