| perpetual(adjective, sound, continue, steady, persistent) |
| endless(adjective, sound, continue, certain, steady) |
| constant(adjective, dull, sound, continue, certain) |
| unceasing(adjective, continue, steady, persistent, constant) |
| incessant(adjective, sound, continue, steady, regular) |
| continual(adjective, dull, continue, certain, boring) |
| everlasting(adjective, continue, steady, persistent, constant) |
| unending(adjective, continue, steady, persistent, constant) |
| unremitting(verb, adjective, sound, continue, steady) |
| eternal(adjective, continue, certain, pause, steady) |
| uninterrupted(adjective, sound, continue, steady, regular) |
| continuous(verb, adjective, sound, continue, certain) |
| interminable(adjective, continue, steady, persistent, constant) |
| persistent(adjective, continue, certain, steady, regular) |
| immortal(adjective, continue, constant, endless, infinite) |
| never-ending(adjective, continue, steady, regular, persistent) |
| permanent(adjective, steady, persistent, constant, continuous) |
| unbroken(verb, adjective, sound, steady, regular) |
| non-stop(adjective, continual) |
| timeless(adjective, continue, constant, continuous, endless) |