| immobile(adjective, intense, resolute, persistent, rigid) |
| in residence |
| incessant(adjective, stable, persistent, constant, continuous) |
| indissoluble(adjective, enduring, permanent, everlasting, eternal) |
| interminable(adjective, persistent, constant, continuous, endless) |
| lifelong(fixed, persistent, hardened, lasting, permanent) |
| long-term(lasting, permanent, lifelong) |
| old(adjective, continue, hardened, permanent, confirmed) |
| patient(adjective, persevering) |
| perduring(tough, stable, sturdy, constant, enduring) |
| prevailing(verb, adjective, strong, flat, certain) |
| protracted(adjective, persistent, continuous, lasting, continuing) |
| resident |
| resolute(adjective, calm, strong, secure, flat) |
| rigid(adjective, intense, definite, fixed, resolute) |
| set(adjective, calm, strong, secure, flat) |
| solid(adjective, calm, strong, firm, certain) |
| stabile(adjective, calm, strong, secure, firm) |
| stationary(calm, strong, solid, steady, substantial) |
| tenacious(adjective, strong, tough, definite, persistent) |