| durable(adjective, tough, stable, sturdy, constant) |
| abiding(tough, stable, sturdy, constant, enduring) |
| aged |
| constant(tough, stable, sturdy, enduring, lasting) |
| enduring(tough, stable, sturdy, constant, lasting) |
| immutable(stable, constant, enduring, lasting, perpetual) |
| lasting(tough, stable, sturdy, constant, vast) |
| long-lasting(tough, stable, sturdy, constant, enduring) |
| perdurable(tough, stable, sturdy, constant, enduring) |
| perennial(stable, constant, enduring, lasting, durable) |
| permanent(adjective, constant, lasting) |
| perpetual(stable, constant, enduring, lasting, durable) |
| persistent(tough, stable, sturdy, constant, enduring) |
| stable(tough, sturdy, constant, enduring, lasting) |
| steadfast(stable, constant, enduring, lasting, perpetual) |
| unfading(stable, constant, vast, enduring, lasting) |
| ancient |
| antique |
| changeless(stable, constant, enduring, lasting, durable) |
| chronic |