| long-term(adjective, permanent, lifelong) |
| mammoth(adjective, huge, vast, immense, massive) |
| massive(adjective, huge, vast, immense, infinite) |
| monolithic(adjective, continuous) |
| monumental(adjective, huge, vast, immense, massive) |
| myriad(adjective, innumerable) |
| never-ceasing(continuous, everlasting, uninterrupted, eternal, undying) |
| never-failing |
| no holds barred(expression, adjective, idiom, immense, infinite) |
| over-long |
| perdurable(continuous, permanent, unlimited, everlasting, eternal) |
| persisting(adjective, determined, steady, stable, persistent) |
| ponderous(adjective, wordy) |
| prodigious(adjective, huge, vast, immense, massive) |
| progressive |
| repetitious(adjective, continuous, everlasting, uninterrupted, recurring) |
| stupendous(adjective, huge, vast, massive, unlimited) |
| sumless |
| sustained(adjective, persistent, constant, continuous, relentless) |
| tremendous(adjective, great, big, huge, vast) |