| incalculable |
| incessant(adjective, persistent, continuous, endless, infinite) |
| incomprehensible |
| inexhaustible |
| innumerable |
| long(endless, protracted, incessant, long-winded, ceaseless) |
| long-drawn-out(endless, protracted, incessant, long-winded, ceaseless) |
| long-winded(endless, protracted, incessant, ceaseless) |
| looped(endless, infinite, boundless, incessant, ceaseless) |
| never-ending(continuous, endless, infinite, boundless, incessant) |
| no end of(expression, idiom, free, endless, infinite) |
| no end to(expression, idiom, free, endless, infinite) |
| on a treadmill(expression, idiom, free, endless, infinite) |
| permanent(endless, infinite, boundless, protracted, incessant) |
| protracted(endless, infinite, boundless, incessant, long-winded) |
| spun out(expression, free, endless, infinite, boundless) |
| strung out(expression, free, endless, infinite, boundless) |
| termless |
| timeless(continuous, endless, infinite, boundless, incessant) |
| unbound(free, endless, infinite, boundless, protracted) |