Adjectives

(a)permanent, lastingcontinuing or enduring without marked change in status or condition or place“permanent secretary to the president”, “permanent address”, “literature of permanent value”
(s)durable, lasting, long-lasting, long-livedexisting for a long time“hopes for a durable peace”, “a long-lasting friendship”
(a)persistent, lastingretained; not shed“persistent leaves remain attached past maturity”, “the persistent gills of fishes”
(s)lastinglasting a long time without change“a lasting relationship”