| persistent(adjective, stable, resolute, constant, dedicated) |
| uniform(adjective, set, smooth, right, firm) |
| invariant(adjective, even, same) |
| lasting(adjective, stable, fixed, constant, enduring) |
| indestructible(adjective, stable, constant, enduring, lasting) |
| rigid(adjective, set, severe, firm, still) |
| unchanged(adjective, fixed, uniform, static, unvarying) |
| durable(adjective, set, firm, solid, stable) |
| set(adjective, severe, firm, harsh, solid) |
| stationary(adjective, still, motionless) |
| unfailing(adjective, change, set, clear, firm) |
| fast(adjective, firm, solid, stable, fixed) |
| irreversible(adjective, irrevocable) |
| solid(adjective, severe, firm, harsh, stable) |
| static(adjective, set, severe, exact, regular) |
| unvaried |
| consistent(adjective, change, set, smooth, right) |
| immovable(adjective, set, firm, solid, still) |
| inert(adjective, still, passive, motionless, stationary) |
| inevitable(adjective, certain, fixed, unquestionable, permanent) |