| permanent(adjective, constant, continuous, endless, infinite) |
| steady(adjective, determined, regular, resolute, even) |
| boundless(adjective, constant, endless, immense, infinite) |
| perennial(adjective, enduring, perpetual) |
| sempiternal(adjective, eternal) |
| undying(adjective, constant, abundant, endless, infinite) |
| vast(adjective, large, absolute, huge, immense) |
| inexhaustible(adjective, absolute, endless, immense, infinite) |
| nonstop(adjective, adverb, steady, regular, even) |
| relentless(adjective, adverb, determined, constant, obstinate) |
| unlimited(adjective, constant, abundant, unrestrained, endless) |
| ageless |
| enduring(adjective, determined, constant, endless, infinite) |
| eterne(adjective, continue, archaism) |
| measureless(adjective, absolute, abundant, endless, immense) |
| protracted(adjective, endless, infinite, boundless, incessant) |
| regular(adjective, timeless) |
| unbroken(adjective, steady, regular, even, constant) |
| unchanging(adjective, continual, unceasing) |
| unvarying |