| perpetual(adjective, characteristic, time, eternity) |
| persistent(adjective, characteristic, time, eternity) |
| persisting(adjective, characteristic, time, eternity) |
| recurrent(adjective, characteristic, time, eternity) |
| regular(adjective, characteristic, time, eternity) |
| relentless(adjective, characteristic, time, eternity) |
| reliable(adjective, characteristic, certainty, absoluteness) |
| repeated(adjective, characteristic, time, eternity) |
| repetitive(adjective, characteristic, time, eternity) |
| running(adjective, characteristic, time, eternity) |
| sacrosanct(adjective, characteristic, certainty, absoluteness) |
| safe(adjective, characteristic, certainty, absoluteness) |
| secure(adjective, characteristic, certainty, absoluteness) |
| solid(adjective, characteristic, certainty, absoluteness) |
| staying(adjective, characteristic, time, eternity) |
| steady(adjective, characteristic, time, eternity) |
| sure(adjective, characteristic, certainty, absoluteness) |
| sure-fire(adjective, characteristic, certainty, absoluteness) |
| tested(adjective, characteristic, certainty, absoluteness) |
| timeless(adjective, characteristic, time, eternity) |