| continual(adjective, stable, constant, enduring, lasting) |
| indestructible(adjective, stable, constant, enduring, unable) |
| timeless(vast, lasting, permanent, everlasting, eternal) |
| unceasing(lasting, permanent, everlasting, unending, perpetuity) |
| unending |
| unfailing(fixed, static, unchangeable) |
| unvarying(adjective, fixed, static, unchangeable) |
| aged |
| changeless(stable, fixed, constant, enduring, lasting) |
| continuing(fixed, static, unchangeable) |
| durable(stable, constant, enduring, lasting, perpetual) |
| fixed(stable, constant, enduring, lasting, static) |
| immutable(stable, fixed, constant, enduring, lasting) |
| interminable |
| long-lasting(stable, constant, enduring, lasting, durable) |
| never-dying |
| perdurable(stable, constant, enduring, lasting, permanent) |
| perduring(stable, constant, vast, enduring, lasting) |
| rigid(fixed, static, unchangeable) |
| stable(constant, enduring, lasting, perpetual) |