| abiding(stable, constant, enduring, lasting, permanent) |
| changeless(stable, constant, enduring, lasting, durable) |
| constant(stable, enduring, lasting, permanent, perpetual) |
| continual(stable, constant, enduring, lasting, permanent) |
| continuing(permanent, long-term, lifelong) |
| deep-rooted(permanent, long-term, lifelong) |
| diurnal(stable, constant, vast, enduring, lasting) |
| durable(stable, constant, enduring, lasting, permanent) |
| endless(permanent, long-term, lifelong) |
| enduring(stable, constant, lasting, permanent, durable) |
| eternal(vast, enduring, lasting, permanent, perpetual) |
| everlasting(stable, constant, vast, enduring, lasting) |
| fixed(stable, constant, enduring, lasting, permanent) |
| for keeps(expression, stable, constant, enduring, lasting) |
| forever(stable, constant, vast, enduring, lasting) |
| forever and a day(expression, idiom, stable, constant, lasting) |
| imperishable(stable, constant, vast, enduring, lasting) |
| incessant(permanent, long-term, lifelong) |
| indelible(permanent, long-term, lifelong) |
| indestructible(stable, constant, enduring, lasting, durable) |