| limitless(adjective, constant, absolute, abundant, endless) |
| ongoing(adjective, continue, constant, current, continuous) |
| unbounded(adjective, constant, absolute, abundant, unrestrained) |
| unchangeable(adjective, set, regular, fixed, constant) |
| without end(expression, adjective, idiom, present, constant) |
| evergreen(perpetuity, diuturnity) |
| innumerable(adjective, infinite, infinity) |
| inveterate(adjective, familiar, usual, established, hardened) |
| lifelong(adjective, familiar, established, permanent, durable) |
| long(adjective, endless, durable, incessant, ceaseless) |
| perdurable(adjective, stable, constant, endless, enduring) |
| repetitive(adjective, continuous) |
| running(adjective, steady, constant, flowing, frequent) |
| unfading(stable, fixed, constant, enduring, lasting) |
| uniform(adjective, dull, steady, stable, regular) |
| amaranthine(adjective, continue, constant, endless, infinite) |
| around-the-clock(adjective, continue, continual) |
| coeternal |
| confirmed(adjective, usual, regular, routine, normal) |
| consecutive(adjective, present, steady, stable, regular) |