| recurring(adjective, regular, normal, persistent, lasting) |
| sustained(adjective, persistent, constant, continuous, endless) |
| unfailing(adjective, continue, certain, constant, unchanging) |
| uniform(adjective, smooth, right, flat, level) |
| continued(adjective, constant, continuous, everlasting, uninterrupted) |
| enduring(adjective, certain, determined, stable, persistent) |
| invariable(adjective, certain, steady, stable, regular) |
| never-ending(adjective, determined, persistent, constant, obstinate) |
| ongoing(adjective, continue, constant, continuous, permanent) |
| timeless(adjective, continue, constant, incessant, eternal) |
| customary(adjective, usual, regular, normal, established) |
| cyclical(adjective, regular, continuous) |
| infinite(adjective, constant, abundant, unrestrained, endless) |
| normal(adjective, usual, regular, established, hardened) |
| repetitious(adjective, frequent) |
| round-the-clock(adjective, continue) |
| sempiternal(adjective, eternal, perpetuity) |
| stable(adjective, direct, smooth, right, flat) |
| straight(adjective, smooth, right, flat, certain) |
| undying(adjective, constant, continuous, enduring, lasting) |