[adj] existing for a long time; "hopes for a durable peace"; "a long-lasting friendship"
[adj] lasting for an indefinitely long period of time
[adj] continuing or enduring without marked change in status or condition or place; "permanent secretary to the president"; "permanent address"; "literature of permanent value"
[adj] (biology) retained; not shed; "persistent leaves remain attached past maturity"; "the persistent gills of fishes"
[adj] lasting a long time without change; "a lasting relationship"
abiding, aeonian, ageless, durable, enduring, eonian, eternal, everlasting, immortal, imperishable, indissoluble, long, long-lasting, long-lived, permanent, perpetual, persistent, standing(a), unceasing, unending