Existing for a long time:
— Hopes for a durable peace.

synonyms: lasting, long-lasting, long-lived.

Roget 110: durable; lasting etc. v.; of long duration, of long-standing; permanent, endless, chronic, long-standing; intransient^†, intransitive; intransmutable^†, persistent; lifelong, livelong; longeval^†, long-lived, macrobiotic, diuturnal^†, evergreen, perennial; sempervirent^†, sempervirid^†; unrelenting, unintermitting^†, unremitting; perpetual etc. 112.    lingering, protracted, prolonged, spun out etc. v.. long-pending, long-winded; slow etc. 275.    ... show more

Polish: długookresowy

Capable of withstanding wear and tear and decay:
— Durable denim jeans.

synonym: long-wearing.

Very long lasting:
— Less durable rocks were gradually worn away to form valleys.
— The perdurable granite of the ancient Appalachian spine of the continent.

synonyms: indestructible, perdurable, undestroyable.

Roget 150: unchangeable, immutable; unaltered, unalterable; not to be changed, constant; permanent etc. 141; invariable, undeviating; stable, durable; perennial etc. (diuturnal) 110^†.    fixed, steadfast, firm, fast, steady, balanced; confirmed, valid; fiducial^†; immovable, irremovable, riveted, rooted; settled, established etc. v.; vested; incontrovertible, stereotyped, indeclinable.    tethered, anchored, moored, at anchor, on a rock, rock solid, firm as a rock; firmly seated, firmly established etc. v.; deep-rooted, ineradicable; inveterate; obstinate etc. 606.    transfixed, stuck fast, aground, high and dry, stranded.    [movable object rendered unmovable] stuck, jammed; unremovable; quiescent etc. 265; deterioration etc. 659.    indefeasible, irretrievable, intransmutable^†, incommutable^†, irresoluble^†, irrevocable, irreversible, reverseless^†, inextinguishable, irreducible; indissoluble, indissolvable^†; indestructible, undying, imperishable, incorruptible, indelible, indeciduous^†; insusceptible, insusceptible of change.    ... show more