| countless(adjective, complete, indefinite, immense, infinite) |
| unfathomable(adjective, complete, deep, abundant, immense) |
| untold(adjective, unrestrained, indefinite, immense, infinite) |
| continuing(adjective, certain, reliable, continuous, trustworthy) |
| long(adjective, incessant, ceaseless) |
| long-drawn-out(adjective, dull, boring, dreary, annoying) |
| long-winded(adjective, wordy, incessant, ceaseless) |
| monotonous(adjective, dull, boring, persistent, tedious) |
| non-stop |
| nonstop(adjective, direct, continue, persistent, constant) |
| steady(adjective, determined, regular, persistent, constant) |
| indefinite(adjective, complete, absolute, unrestrained, immense) |
| bottomless(adjective, certain, deep, immense, infinite) |
| imperishable(adjective, continuous, everlasting, uninterrupted, eternal) |
| lengthy(adjective, wordy) |
| relentless(adjective, continue, determined, steady, persistent) |
| unrelenting(adjective, certain, determined, persistent, constant) |
| amaranthine(adjective, continue, constant, abundant, unrestrained) |
| chronic(adjective, persistent, constant, continuous, relentless) |
| extended |