| forever(adverb, vast, permanent, everlasting, always) |
| abiding(permanent, long-term, lifelong) |
| constant(permanent, long-term, lifelong) |
| continual(permanent, long-term, lifelong) |
| continuing(permanent, long-term, lifelong) |
| deep-rooted(permanent, long-term, lifelong) |
| durable(permanent, long-term, lifelong) |
| endless(permanent, long-term, lifelong) |
| eternal(vast, permanent, long-term, lifelong, diurnal) |
| everlasting(vast, permanent, long-term, lifelong, diurnal) |
| in for the long haul(expression, idiom, vast, permanent, long-term) |
| incessant(permanent, 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(permanent, long-term) |
| long-term(vast, permanent, lifelong, diurnal, ceaselessly) |
| longstanding(vast, permanent, long-term, lifelong, diurnal) |
| old(permanent, long-term, lifelong) |