Synonyms:
- abiding,
- age-long,
- aged,
- ancient,
- antique,
- chronic,
- constant,
- continuing,
- diuturnal,
- durable,
- enduring,
- evergreen,
- hardy,
- immutable,
- intransient,
- inveterate,
- lasting,
- lifelong,
- long-lived,
- long-standing,
- long-term,
- longeval,
- longevous,
- macrobiotic,
- of long duration,
- of long standing,
- old,
- perdurable,
- perduring,
- perennial,
- permanent,
- perpetual,
- persistent,
- persisting,
- remaining,
- sempervirent,
- stable,
- staying,
- steadfast,
- tough,
- unfading,
- vital