Synonyms:
- abiding,
- age-long,
- aged,
- ageless,
- ancient,
- antique,
- ceaseless,
- chronic,
- coeternal,
- constant,
- continual,
- continuing,
- continuous,
- dateless,
- diuturnal,
- durable,
- endless,
- enduring,
- eternal,
- eterne,
- ever-being,
- ever-durable,
- ever-during,
- evergreen,
- everlasting,
- everliving,
- hardy,
- illimitable,
- immemorial,
- immutable,
- incessant,
- indestructible,
- infinite,
- interminable,
- intransient,
- inveterate,
- lasting,
- long-lasting,
- long-lived,
- long-standing,
- long-term,
- longeval,
- longevous,
- macrobiotic,
- never-ceasing,
- never-ending,
- nonstop,
- nonterminating,
- nonterminous,
- of long duration,
- of long standing,
- olamic,
- perduring,
- perennial,
- permanent,
- perpetual,
- persistent,
- persisting,
- remaining,
- sempervirent,
- sempiternal,
- stable,
- staying,
- steadfast,
- steady,
- timeless,
- tough,
- unceasing,
- unending,
- unfading,
- unintermitting,
- uninterrupted,
- unremitting,
- vital,
- without end