| never-ending(adjective, constant, continuous, endless, infinite) |
| long(adjective, slow, tedious, late, endless) |
| timeless(adjective, continue, steady, constant, continuous) |
| unbounded(adjective, complete, absolute, abundant, indefinite) |
| illimitable(adjective, complete, constant, absolute, endless) |
| incalculable(adjective, complete, absolute, abundant, indefinite) |
| inexhaustible(adjective, absolute, endless, immense, infinite) |
| innumerable(adjective, infinite, infinity) |
| lengthy(adjective, slow, late, long, rambling) |
| measureless(adjective, complete, absolute, endless, indefinite) |
| monotonous(adjective, dull, stupid, persistent, constant) |
| permanent(adjective, steady, persistent, constant, continuous) |
| prolonged(adjective, slow, steady, stable, regular) |
| vast(adjective, complete, absolute, huge, indefinite) |
| lasting(adjective, persistent, constant, continuous, endless) |
| protracted(adjective, slow, tedious, late, long) |
| undying(adjective, constant, abundant, continuous, unrestrained) |
| continuing(adjective, continuous, endless, unrelenting, never-ending) |
| immortal(adjective, constant, abundant, unrestrained, endless) |
| non-stop |