| perennial(adjective, familiar, established, hardened, enduring) |
| continuing(adjective, familiar, fixed, persistent, lasting) |
| eternal(adjective, permanent, durable, recurrent, perpetual) |
| enduring(adjective, familiar, fixed, established, hardened) |
| chronic(adjective, fixed, persistent, hardened, lasting) |
| durable(adjective, permanent, durable, recurrent, perpetual) |
| lasting(adjective, fixed, persistent, permanent, durable) |
| lifetime(adjective, lasting, durable) |
| old(adjective, familiar, established, hardened, traditional) |
| permanent(adjective, hardened, lasting, confirmed, perpetual) |
| perpetual(adjective, familiar, established, permanent, durable) |
| inveterate(adjective, familiar, fixed, persistent, established) |
| livelong(adjective, lasting, durable, diuturnity, longstanding) |
| long-lived(adjective, familiar, persistent, established, hardened) |
| persistent(adjective, continuous, hardened, lasting, continuing) |
| womb-to-tomb |
| constant(adjective, familiar, fixed, persistent, established) |
| endless(permanent, long-term, diuturnity) |
| everlasting(adjective, permanent, durable, recurrent, perpetual) |
| long-lasting(adjective, familiar, established, hardened, lasting) |