| sempiternal(adjective, eternal, perpetuity) |
| unfailing(adjective, continue, certain, unchanging) |
| uniform(adjective, steady, regular, persistent, even) |
| unlimited(adjective, certain, constant, abundant, endless) |
| ageless |
| chronic(adjective, fixed, persistent, constant, continuous) |
| continued |
| ongoing(adjective, continue) |
| running |
| straight(adjective, certain, reliable, continuous, trustworthy) |
| sustained(adjective, persistent, constant, continuous, endless) |
| unrelenting(adjective, certain, persistent, constant, reliable) |
| abiding(adjective, certain, persistent, constant, reliable) |
| around-the-clock(adjective, continue, continual) |
| connected(adjective, steady, persistent, constant, continuous) |
| consecutive(adjective, steady, persistent, constant, continuous) |
| even(verb, adjective, sound, steady, regular) |
| habitual(adjective, steady, regular, persistent, even) |
| immemorial(adjective, infinite) |
| indestructible |