| eternal(vast, permanent, recurrent, perpetual, long-term) |
| everlasting(vast, permanent, recurrent, perpetual, long-term) |
| forever(vast, permanent, long-term, lifelong, diurnal) |
| hoary |
| in for the long haul(expression, idiom, vast, permanent, long-term) |
| incessant(permanent, recurrent, perpetual, long-term, lifelong) |
| indelible(permanent, long-term, lifelong) |
| indissoluble(permanent, long-term, lifelong) |
| inexhaustible(permanent, long-term, lifelong) |
| inexpungible(vast, permanent, long-term, lifelong, diurnal) |
| lifelong(adjective, permanent, recurrent, perpetual, long-term) |
| long-lasting(permanent, recurrent, perpetual, long-term, lifelong) |
| long-term(vast, permanent, lifelong, diurnal, ceaselessly) |
| longer |
| obsolete |
| olden |
| outdated |
| perdurable(fundamental, permanent, continuing, operating, recurrent) |
| permanent(vast, recurrent, perpetual, long-term, lifelong) |
| perpetual(permanent, recurrent, long-term, lifelong, returning) |